Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2f9342d1ac6d9b…

MALICIOUS

PDF

88.1 KB Created: 2021-07-13 15:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bb99ed720a26d3f46007452bd94e626 SHA-1: 1bf42fa2c6f366c82cb7599ef45fbcf6f605fc47 SHA-256: 9d2f9342d1ac6d9b088f11a8f4d8f59579648a858319823148169cbe55097725
164 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised infrastructure suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://barsugo.com/ckfinder/userfiles/files/19996113249.pdf
    • http://king-pro.com/userfiles/files/93586338795.pdf
    • http://prime-standard.com/piceditor/file/pitanodavekuzogumu.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd67a49133---83969935084.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f79552a18c---nujigux.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/aea26547186ccd3430587a775b84a7a1/94536943287.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/sb90c3q4tub347t6emisbuahed/dameruvikuxisenalupogova.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/46ncggree2k9idac11153clalg/91421189193.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/7bb61fc5fe7948b0903b8da7f65bfc15/nigenopuxibib.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607239326e682---dikijebaxalegewokinib.pdf
    • http://border-inn.com/CKEdit/upload/files/zadapewaxonivotakemod.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160707cda6fe4b---lilawakamukujo.pdf
    • http://www.themixchange.com/userfiles/files/pakejosepipedexike.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5f313af5c---28230785322.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/98iuf8efik2iogpeonun22d1nc/44800133867.pdf
    • http://ahchala.com/img/file/salabetosot.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb12c4c49---49152839665.pdf
    • http://kgmda.com/upload/files/3621708879.pdf
    • http://animationcoach.com/userfiles/file/xovuraxojubozagagotudib.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8239c67b9---53328096778.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b224135c4a---suxofixugodorelup.pdf
    • http://amandatravel.com/userfiles/file/texebufud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=his+first+flight+questions+answers+for+class+11
    • 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_off0000f044.bin
f450a1b64539492fc3440ce2563eb02b5412fd99cccffe6ca6f28998bee8341c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 19336 bytes
font_01_sfnt_off000121cf.bin
74add0098de6af427361757106f59b73fd8c15549fad9e9627d895887b22931d
pdf-font-stream PDF embedded font (sfnt) at offset 0x121CF 10992 bytes
font_02_sfnt_off00013b08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B08 16792 bytes