Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67339dc9d0ac4d2…

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 10:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9bc0ebde54d56b0c2dfc57a8baf0253d SHA-1: 4aa837099ab8c066dc9300b7877525a3551b465f SHA-256: f67339dc9d0ac4d2e21115d160a43ec53f73fa5e1d3a3893f828230384031d98
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to various external websites, some of which are hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to potentially harmful content.

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 http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/naxabotapagamonuzeko.pdf In PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c382d7eefd0bce754cfb32b436e8b913/25482541152.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/89329861512.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210904140615.pdfIn PDF document text
    • https://jck.ro/userfiles/file/81194323622.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/90463584697.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/93456263754.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147dda2c2087---kobazikovu.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8bd3ff25b8e43e10feeea6765c5e43da/gidovubukigizamujuditenal.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/92127587803.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/148c14a6f3d51e8006270480e97919a5/94128217546.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/zamekun.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/1f93111e9578c0b58e2d2f58c434a1da/64254194493.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/7231032896.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/98106530156.pdfIn PDF document text
    • https://lordoptika.hu/files/files/lesitejexalasikero.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/83212046943.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/vajipaj.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/24686874879.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/42900582855.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/46651566265.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/95594952617.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/gotuzumived.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/70241313621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+how+to+delete+trashPDF 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_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001027f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027F 17652 bytes
SHA-256: 13bf9b602bbe5036a23a63f36517dbe7483d1ab970f2201f5d01015a95021c97
font_02_sfnt_off00012fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB0 10412 bytes
SHA-256: 9e3c2268ee771d77fdbbe1af4113111ecd4a61eff1c0a75d5b277d000838902b

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