Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e166e3269bf27d7…

MALICIOUS

PDF

77.3 KB Created: 2021-06-28 05:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d32a97aa9df24e3c7e89280c806adc2 SHA-1: 31ad7f6db866d4a81ed829cc05b389f5f2942cef SHA-256: 6e166e3269bf27d78fc56c31c98896d6e82685fd2f8ec12ab4b61fab349c6757
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The PDF's structure and the presence of multiple external links indicate it is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://sevimticaret.net/userfiles/file/kuwubowemanetebije.pdf
    • http://rialta.ie/userfiles/files/50490109425.pdf
    • http://lso-msm.fr/userfiles/file/wupakobujameludukuroj.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1i369gp7q581hhqt2r6t6hta93/duvalujomilimi.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/0ee84215842c8bdcc27db5d1b0349d2a/80796827456.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/nlcn4lqmu3qditqvc7q37j80i8/vamobes.pdf
    • https://amrapalispot.com/userfiles/file/69017608132.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/8c3d60ccf90e797ce3181ab9514bb6b7/morababebatolakatatofeli.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b237a981a7---giwisadazizuraxunowixaz.pdf
    • http://stalmont.eu/userfiles/file/tigolivemusos.pdf
    • https://2acontractor.it/images/file/59528064741.pdf
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/79508966046.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67e6ebd322123dd2c5c927a26fa121a4/bejufogulilunemodule.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/e2rr468ktldm73brt8dntlljk4/nezosasozu.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a6703101---77987956270.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hfllm1clgsjidrq9ib5j6pgmkj/perixilokavipogek.pdf
    • https://condominiobrisasdelnorte.com/userfiles/file/xedata.pdf
    • http://chayka-svg.ru/files/43162517827.pdf
    • http://gemwishrs.com/ckfinder/stones/files/15543526007.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e51f24984c915c199701bac35305e9ea/4161533537.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/9462deda351d7e0220fa301713fbb2fe/xomenanujozufanajox.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/5htpovfoh7el5ka06jgq3g36k2/78277493551.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=square+root+of+576+by+prime+factorization
    • 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_off0000ca9b.bin
b1cd7d82ec5f8f7dc60a03981ed166d903169d26741a1265154ebd3d5fc9a48c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9B 11416 bytes
font_01_sfnt_off0000e589.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 16792 bytes
font_02_sfnt_off0000fd9b.bin
b250a5e1d785c9774a1912886c82750f6c61d807b7c06d77f96b2d8fe32cf16f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 16352 bytes