Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcf25c97645897d…

MALICIOUS

PDF

64.0 KB Created: 2021-05-06 14:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7676caf11228167254e6ac77a1f522d SHA-1: f83c3ed3f9e37da174118f0b5655efa55d921d0c SHA-256: fbcf25c97645897da097f7495ff6f41345ab2158b23770bed55ae90b4c9880f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded links point towards a common tactic of using deceptive content to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8681

Heuristics 5

  • 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
  • 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://ludifrance.fr/userfiles/file/93071455057.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085957027f5a---kasujapizon.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160875fbb76aab---93643696621.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e02b7ee0de---93704073682.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0fce51945---lewepigizuzokex.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92c3cfb16---24295951939.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/06ea5baf98133ea001e79bb142702fcb/vevubetalobitisoso.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/n9om7ksnm5teel04l843g7eo52/bujajarip.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/1fee11060c61c499c123e6a2b9080f11/warobezodixa.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607727c591f28---warosisesepevobezofexufa.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/b414aa0554d065e9323e39bd690cc051/27408675242.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608743a85a75c---23634809779.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073c9a8f0b9b---pulelekatatepolosedugute.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/ab74e90641c9873651151a4b0f0b23c8/ragapanevijazuvi.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d095a2cdcb0276abb03db006705b1d66/93026804657.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/d2iapj86u892b9pf4rgnj6n9tc/37180368516.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=flowchart+exercises+for+students+with+answers
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f0.bin
5ce23fbe2335d7c820e3fd7e2163f5ed34b484ea66aea4952b54e856e5d486c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 5224 bytes

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