Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b9f28ce32d3f9c…

MALICIOUS

PDF

73.0 KB Created: 2021-07-28 01:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0def29d07eb4cfa7bafbfc47aa303bbc SHA-1: 54a5cec443b369385d2f57c94dcd5677248e47ff SHA-256: 39b9f28ce32d3f9c3668a4cbd3f15cabc258dbf84dab3ba0194b0fc0b80d6194
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous other PDFs hosted on compromised websites, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs confirm the nature of the attack as a multi-stage redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://elsekmont.eu/userfiles/file/parudezavaniwirop.pdf In PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/26101749950.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5kc6utl6hm1j35n202knr5htpk/86721063574.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b55e642be1a---61937598568.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/550c423bef075481beb6e2a1325af914/37546184757.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/74687857635.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/lorafatol.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/1f0bnfj978ip38me2a16lrafb1/69439376958.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af91246db74---bomuxawafi.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f238db028d3---bizaku.pdfIn PDF document text
    • https://dietacud.eu/upload/file/fekiwawi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b24e4b14160---kolawirafuvelukofoneridi.pdfIn PDF document text
    • http://greenbrier101.com/userimages/ziwalifeb.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/04554eeca46fdad2a64d4f0affd3cddf/78154057037.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/libatujoxeson.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086639126edc---dejivisiv.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/1plsvvgasl5b4hls4h0i3s2b8f/ruvito.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/a3973c0486f9eb7bbb932a3d273e27fd/79861516236.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/2247603629.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/23e6afe66db39a2863131f76c1495eec/74818382542.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/9742045178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=causes+of+positive+afb+smearPDF 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3A 10708 bytes
SHA-256: 6e35b614fa036f690bc222a56bf5d2ce0935a8716b961d98d37e80facbd62049
font_01_sfnt_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 16072 bytes
SHA-256: cf865a0f84b9a29ff30f021829a083a45134606745d7de0189fbb79da936a2c5

Open this report in the interactive analyzer, or submit your own file for analysis.