Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91e985cb324bde1…

MALICIOUS

PDF

86.8 KB Created: 2021-07-18 18:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6787307a59985644c3723a1ef3879845 SHA-1: 9da3b1adefd484a6a4afc9fbbc7a39b6395ab295 SHA-256: e91e985cb324bde12f114dc77704a3b423f94ce8363b307ccbeee90eaa7bce01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern. No scripts were extracted, but the overall structure points to a phishing or SEO-based malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160745a71bf810---54932617434.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/1c98ssqp92onkeokaig7si3fa6/zexaximusamafu.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/dkjkqjv0qh4rg7haq6bscnusf3/98414827269.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160706c9674c1d---4362439955.pdf
    • http://tetobox-budapest.hu/uploads/files/ganelujaxinazija.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/91343005832.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa67ef6a799---nogizeboridemekifuripuvug.pdf
    • http://baaningdoi.com/file_media/file_image/file/vabisalisufixuzafadafir.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160903ee494e46---18624230025.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ba349bc432b---77511448335.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608514dbf2642---98851438752.pdf
    • http://ingenermarket.ru/userfiles/mejuritiniwemarok.pdf
    • http://accronline.com/userfiles/file/mizowobonasozibagu.pdf
    • http://belgium-ex.com/images/blog//file/vagogemu.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/be1785ef41bc751b6b741835296e1de3/96961573549.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa09ef4040---91669616369.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/b17c1c049dedef11369439dd4d4456c6/28169031814.pdf
    • http://files.ibiza-ferien.de/file/6717256758.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088496361e7a---295485489.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c35bc905bdf37cec84a75e816daaf647/22063863156.pdf
    • http://abnicum.ru/files/file/gukod.pdf
    • https://bestofbucerias.com/upload/file/govajutenufevunot.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bd19e9730---54383932263.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b7abb7738---vavopavofofe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+become+judge+of+high+court
    • 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_off0000f03b.bin
779c55074b27df3f3265c2ce0d2ded158176c2e6c74c0e4a76b939f1030e50f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 16992 bytes
font_01_sfnt_off00011cb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB5 16792 bytes
font_02_sfnt_off000134cc.bin
224d270f69081f9ed03d527b5952bbe7173668158b0270defef8f86d9c0aaaeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x134CC 10892 bytes