Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be2038dcb1c6f55…

MALICIOUS

PDF

90.9 KB Created: 2021-07-25 10:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38509d43c3b1ec4eb6fcb96265d5d128 SHA-1: 19f7ae407d03b30b11e209f8163a3021175be6cd SHA-256: 3be2038dcb1c6f551720184f4d372c4cd71dee3d9e0c025a935924c46efbe1db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDFs, suggesting a link farm designed for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/qskqi0e9mhpvah2m14nis4as3q/kolemen.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b615da39da0a8a481012f8da10452183/piximomizumuz.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/chr2a41ja9artepkd8iu5f19e9/jozudunoposurot.pdf
    • http://fanti-fitness.pl/uploads/assets/file/sotibu.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/8ed148eb00bb3c80e8d1eab0082da5fc/firizowodegemusagimavuvod.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2a795965094e1a0814c61b6b480c60ad/38833488584.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0023baa75265328569c98c601892c551/21413328464.pdf
    • http://tasarimak.net/ckfinder/userfiles/files/wudunaziwaxoxupu.pdf
    • https://vayamcs.com/content_files/files/dikilagi.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/566k9r1s69eu0ucavaur959k00/wozabuvilikizemesen.pdf
    • http://bukharageorgia.com/sites/default/files/file/65460182489.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/6sh36p9r9ldik8p850f7qcotsk/1945438147.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8ff15b48---91462632873.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b46075c929254ce82321a41d3cfcd657/76854711559.pdf
    • http://deltastal.ru/userfiles/file/vared.pdf
    • http://tpdw.pl/userfiles/file/bijisaxumugiso.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ra4frp27ehtp53d3qt8s1optq3/50420924219.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/3b2b3c109968b62616fc32d2924908d3/35916464867.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/25079862454.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096d0da449d1---medelofebo.pdf
    • https://indianpowerliftingfederation.com/userfiles/file/monivixiza.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2fb563e368a491427611c4d4288a70d0/65758817273.pdf
    • http://ngocvietbungalow.com/upload/files/kegosilerutavadusefin.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=maths+textbook+year+10+pdf+free+download
    • 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_off0000fcfd.bin
4901558d1a83a4bcf18f850511b2db2b79fcead02d115f539b128350f23d6f2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 17680 bytes
font_01_sfnt_off00012b2b.bin
d1877a6aa5ef67ead6d99d1098224297af73e47034e63e497711ef29d44d409c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2B 11204 bytes
font_02_sfnt_off0001454c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1454C 16792 bytes