Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8e6d0fffdfe91e…

MALICIOUS

PDF

68.2 KB Created: 2021-09-29 13:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 767343659e49ff7dec0937a9179590a3 SHA-1: 801e7a7eebfcd2bcad532d4f84170df501ad9199 SHA-256: cb8e6d0fffdfe91ee6460cd12ea72305c2b1fe6802ff3521774cf3f8c52b909b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://queure.ru/uplcv?utm_term=last+day+on+earth+gold+hack
    • http://thesecurityguardunion.ca/userfiles/files/wezekorujuteguka.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/25447701822.pdf
    • http://hanasushichoice.com/uploads/files/vovebot.pdf
    • https://jiu-hang.com/upfiles/editor/files/visasajuletifesenitekonog.pdf
    • http://luluscafeonline.com/uploads/files/gibam.pdf
    • http://residencecarlofelice.com/userfiles/files/10123294442.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16154071a50c7b---wises.pdf
    • https://namdolove.com/FileData/ckfinder/files/20210920_4DA57E697EAA4EE5.pdf
    • http://autosoftware.company/autoresponders_images/files/93882310514.pdf
    • https://schmitz.cz/res/file/jupavedalowavodaraxula.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/wafunijuluvamiv.pdf
    • http://motovelo-nmsk.ru/userfiles/file/97996891140.pdf
    • https://berbagiangka.com/contents/files/20961850870.pdf
    • https://eurotig.ro/file/gebupituravuketux.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161541603e1964---98696752534.pdf
    • http://copy-office.it/userfiles/file/kafojale.pdf
    • https://vico-domrep.com/ckfinder/userfiles/files/fetusidenetusomoxu.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161520a4f903ee---79319021841.pdf
    • http://mega-treid.com/userfiles/files/wexemabev.pdf
    • http://jingyilin.org/uploads/file/45529641932.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aad0.bin
6537ba2d5cbbf7b48a1de6941041f7b267add9b896c6484cb5af23c7c876369f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD0 15764 bytes
font_01_sfnt_off0000d33c.bin
c920efee83f6292bc59dc2c39058697050c35f54760290cb17fe1c695d70b1c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 10720 bytes
font_02_sfnt_off0000eba4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 16792 bytes

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