Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7aa3de27bad7cfb…

MALICIOUS

PDF

75.2 KB Created: 2021-09-04 14:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35272131cf791d37430583e3d16cb388 SHA-1: e64243ecff95308711123db0f6eb24a4327d7532 SHA-256: c7aa3de27bad7cfbaade8390143400f8248231db0c973d5dbb6b14741795527c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, many of which host other PDF files. Heuristics indicate a link farm on disposable hosting and compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4c11b895f---wineki.pdf In PDF document text
    • http://altelaw.com/uploads/image/file/43409055219.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/60720865077.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911ddadea59---misexisomolasabod.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/zanofefusijobot.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/38669486277.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/93450549384.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160756c9091e8b---fisabatoxopagakewujotu.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd83a22770---68879886657.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/57991521722.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2a5ae578aa801a31d1658f2558b091f8/gumetulowosepoxudemu.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160951bce57a09---gimezaneno.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-8/file/7118867379.pdfIn PDF document text
    • http://thedreams.cz/files/jezosolufitokirawar.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/nulowo.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/tiwaremuvedu.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/somizafufikomekasumeji.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/4626369366.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/pedada.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/59a1e201848ed33b580ec7e6c3fa2243/saragigaduxafim.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/kenorapupisiwog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=rukmini+prakashan+books+pdf+free+downloadPDF 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_off0000b859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06B 20380 bytes
SHA-256: 31a761d6d2323c6535d5a861a77b50372fee8836c191efac014bd84462a39ea1
font_02_sfnt_off0001056b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 11128 bytes
SHA-256: ad416c83e8dfd8d4fe65e226108d79573ac1da87abacb8e90b49deac4566cefe

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