Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77057302ed90110…

MALICIOUS

PDF

97.6 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: 0972605086960fcaffc387cfc1f51d99 SHA-1: cb5e9885c2938aa525b17fda2b3bafc7f8135de8 SHA-256: b77057302ed90110fe053ceaf35fbbc37750d28bfe517dd7fa434e35dc0fd7a6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination or leverage trusted infrastructure. The document body, though heavily obfuscated, contains text related to 'Realidades 2 capitulo 1a page 8 answers', which could be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 6

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

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