Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c031b5b3c876da9…

MALICIOUS

PDF

84.5 KB Created: 2021-08-12 22:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82f20ca2b601bf391a4409da92bfca68 SHA-1: c557386fe73fa84c22288dbbd71f80c4765b8beb SHA-256: 8c031b5b3c876da931bc883f68970f07c57467f6b28f11db9bf785e25748faba
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious or phishing sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://architects-desk.com/uploadsfile/genuku.pdf In PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/d4o2h449iba1qe9i7vvgp6lj93/12493022369.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/jewekesepukugoniwelepoli.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/migelovexure.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7fcafaf0b13a0015d99d6aa675ce3220/65854285712.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/93651970533.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/befegobasikufeneruluner.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e83ea03a81---97777755876.pdfIn PDF document text
    • https://serka.com/serka/upload/files/tugatefatopivalegif.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0jdpsa23kur1mj3brcvpg462a0/43564807710.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/feb5f3226f574d038d81bd795144ed1a/tejozaxivurogimedipalomo.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/83759113780.pdfIn PDF document text
    • https://silga.ca/userfiles/file/wufol.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/qs5d2n5k5tm4ofmlq9feh8v295/20364385063.pdfIn PDF document text
    • http://cold.lt/userfiles/file/85828519412.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210529064629_178448346.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/notarikuredarekifez.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/u7nqeqhrk3uupgpae88ciahdig/bogekagile.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/rududafemadolotesofodugup.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/98647049277.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/ff48b6566da979010fcd5f5fc881f728/43551332993.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1ff5313e83578603ce12b317fe685a88/65602848079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=nccn+guidelines+cervical+cancer+2019PDF 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_off0000e6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D1 10932 bytes
SHA-256: fe7a8916cc5d57ec971c3dcf3e30b9705edde0bd68bcfc71cc6ef2f290fdddc0
font_01_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 16312 bytes
SHA-256: dd04242bb158db840c1b71ca98e07585f67ca355e1ee309948e33f0d1b419144

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