Malicious PDF — malware analysis report

Static analysis result for SHA-256 40311af047c1b106…

MALICIOUS

PDF

486.9 KB Created: 2021-05-27 15:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8e5f05100573441b604d3ea7884850c4 SHA-1: a5cf39f0239f54bd40c4c23fa90d3dfcc589e9a3 SHA-256: 40311af047c1b10674cea11cf864c15325d52bec02af6c7f559c292a7a115274
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ClamAV, specifically as 'Pdf.Phishing.Trojan'. It contains a link farm with numerous URLs, many pointing to PDF files hosted on compromised WordPress sites. The embedded PDF also contains suspicious static findings, including external URI links and a link farm on disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of an embedded PDF artifact with similar heuristic firings further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier clean score 0.0091

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e842d84946---5472057074.pdf In PDF document text
    • https://vicotelecom.vn/static/source/images/file/72815712364.pdfIn PDF document text
    • http://garderoba.sk/images/_file/basonufijopedosavani.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/a5kn49a1ekgo7fuodctvl65ts1/91377398023.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ffaa5bdb2---21210245388.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770ec747282---surunobelinabokujije.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e574ee1022---jevenofejoxeda.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/73b519766c4a0133e1f6f17a98d5e3a6/74794603126.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e3ee42c5ba59eebfa9f3c82adbcf4750/74591595355.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a04140425fb---fobamezu.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/oh3dbeo6qonj2p5b30m82m4fs4/rototetipumajudobasi.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/4f27031c23dd8e48bb137cae5d94b3d5/71470475716.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d83d0d32b---jojobolobobalebeva.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a440f925a76---73526687859.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092737697595---94093032340.pdfIn PDF document text
    • http://aweibel.com/Photo/file/guzeleluridavus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=realidades+2+capitulo+1a+page+8+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 6416 bytes
SHA-256: 62deedb54aaef669db635f4ef87d4bda5d475a8bf20633d6b56d9e4ab12fd410
font_01_sfnt_off0000fbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 5720 bytes
SHA-256: af9d013fe3731689596478fdef1e749369fd3cb3cc70981940606155dcb1af5a
font_02_sfnt_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 10320 bytes
SHA-256: 9afae9cb41a10bec98d088c7661f9ee2d5052fd5ff67f3eef359087078d49f33
font_03_sfnt_off0001308e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308E 12300 bytes
SHA-256: c7426d64ff50a10fdfcc5aeede3d8305a8f941fc4df705a1ae3fedc1e31ca9b3
font_04_sfnt_off0001590f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1590F 16256 bytes
SHA-256: ade860a384e0436df56bb84eeed4a9486ec680d7c8981cdb0c3745c5e2239263
font_05_sfnt_off00016e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E6A 1736 bytes
SHA-256: 74be5bc4d46f64e5c506ae1006f7022dc98ebf960e37c7bf417c2027ca73106d
polyglot_child_pdf_off00018561.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x18561 398946 bytes
SHA-256: 2b587c87e0f81012d787eb83ff374a162639a38b358f719abce5d1e65d14a6e3
Detection
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Obfuscation or payload: unlikely
polyglot_child_pdf_off00030ac2.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x30AC2 299265 bytes
SHA-256: 1f7e075d98d71aa799e2b81ff621e847ce12dc37ea043c25b7f4224cfba5e863
Detection
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Obfuscation or payload: unlikely
polyglot_child_pdf_off00049023.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x49023 199584 bytes
SHA-256: 6a3c696b51b1280c6f3eec2c8d5c19b913680c580c1876fbc694c3d9dc14d72c
Detection
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Obfuscation or payload: unlikely
polyglot_child_pdf_off00061584.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x61584 99903 bytes
SHA-256: b77057302ed90110fe053ceaf35fbbc37750d28bfe517dd7fa434e35dc0fd7a6
Detection
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Obfuscation or payload: unlikely

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