Malicious PDF — malware analysis report

Static analysis result for SHA-256 38331b0b8238d261…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 19:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6349dab24d0a2d5ee40d0e8c7d331b46 SHA-1: ca06261550d73214ce287ba38d5f5d9999f5924d SHA-256: 38331b0b8238d26144c6a4593b2066250d2a93b7db33e03704d82f3211bb68df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The presence of multiple URLs pointing to potentially compromised or disposable hosting suggests an attempt to lure users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic findings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f529e3226f---9090828716.pdf In PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/mujusan.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/43455861656.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/6847789331.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/97408997399.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/puxifudowe.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/ladedadalu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f3b614d4---99417530715.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/37009577347.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/palobepoxusutenevulop.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/31332008019.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/bilulufukibeka.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/90023511327.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/wewagesukenuso.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/getunuzapa.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ba8418087---wesibagan.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/74899164899.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/relizok.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/8234577787.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/99841205779.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/petemunafopabupo.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/42017910452.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081afeecf497---surafibimufodefiparuvusep.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/kavofiligemafosoj.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160897b1171bc0---gawabarisunikutiroweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=generate+pdf+ssrs+report+programmaticallyPDF 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_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 11116 bytes
SHA-256: 19ee875864f0deff9ef905135555b2fff0486b420163689d21688540ba60fd13
font_02_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 18980 bytes
SHA-256: fbcb3662d2f5c60ade7bdb063e87acddc136e0766e7a73b1d757632837cfde59

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