Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e6f0ed53316e08…

MALICIOUS

PDF

85.1 KB Created: 2021-07-21 15:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76d9498ece1558902763b2612a811997 SHA-1: cb15e6b9a1a1a2be26e66962cced049d733cd846 SHA-256: d4e6f0ed53316e08673da33dc8fae9284c66a71480a5ea8bfca99cd12cecbc27
156 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple URLs pointing to potentially compromised websites or disposable hosting, a common tactic for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and link farm heuristics supports the classification as a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://podlahypilat.cz/admin/file/50898107250.pdf In PDF document text
    • http://cpgny.com/userfiles/files/33561334324.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607878584643f---peraj.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/ninikoxaxivoridufomomejor.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621429795.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ca3bc2733---rabufu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074713d59412---vevasakugekom.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/lanosefinofofirulazabo.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1623907481.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/fimivejexave.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/lipimurutaxukulafa.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8a88d2e8b---8215788388.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/8cej5vfbcopqc1m112bqjdint5/vajejotub.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a4d7b2e25---bufazuzevogirevil.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c6f90e798ed67b715a8cdd92adcb1602/vepogidulutakodefovugemuf.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/wofifonig.pdfIn PDF document text
    • http://muszempilla.com/files/file/rulefebawalubapifikel.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/bipozokiw.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7554656c5---90207276030.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e532498d380---soxarobakuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=old+fashioned+cornbread+dressing+with+boiled+eggsPDF 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_off0000e744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 11004 bytes
SHA-256: 084cf2ff1212e185a6cb015c8e92506a41036807dfd0ab0ff1b868f315ed862e
font_02_sfnt_off000118b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B3 17072 bytes
SHA-256: 20b2fe7216684920402e3b25375165d274235e474f7c793fbcf0bf9e83bf4fde

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