Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3cea88d82bfbe3…

MALICIOUS

PDF

89.9 KB Created: 2021-07-03 11:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e41d8149e00a2a45a0d0c80f118c545 SHA-1: a0cbf55eae8a770995044fa32d161fb882ae5bf6 SHA-256: ca3cea88d82bfbe325dbe2f3c5bcfb722ecd6c0737b02162b16f586d8e8c3983
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=pvc+which+type+of+polymer
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/aea8307393e97e74a553a33eed103f96/44030156427.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/95f83480537d3d4686d459fda3edc842/11479849818.pdf
    • http://busankid.com/webfiles/board/file///telipaduxekixonarikibef.pdf
    • http://saokienviet.com/uploads/image/files/24533548011.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/466e15165602e0dd4a2fd495bbd176f3/goroxixijexozorowe.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/dba1d3fd34a6207496b85f964fb0a47e/wixatejirotulopanajepe.pdf
    • http://www.allatpatikapecs.hu/images/file/wivadoxuvosokewivizimi.pdf
    • https://scheidungsrecht-best.de/userfiles/file/dalizobad.pdf
    • http://adance0112.com/upfile/editor/file/kazeruwagapekujukefu.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a27f720d3---54561960431.pdf
    • http://anoh.net/pds/userfiles/files/96044482015.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16074618639420---36188124110.pdf
    • http://dgjst.com/upfile/file/57430062762.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1a959eb9e7652d04aab1f2460893716d/zinogulokokubuxigubamiw.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609257b556ecf---mikujidaxezenidefu.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082e222600c5---10373005623.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ar7elpgqtcgg9fb4mv2m80bse5/89597568330.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/ca19a7f8348d6a5397a073c1ff5b7568/36232750136.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7057c8b6d---60088820752.pdf
    • http://maroba-zirndorf.de/file/jujowibulo.pdf
    • http://ubest.ru/images/file/dukolaledonatewiwi.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/bixizaradodizaga.pdf
    • 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_off0000fe3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 16792 bytes
font_01_sfnt_off0001164d.bin
0d6c3d0c04952ee39e2666135bc82210a34e1b827411bb84f74a1cff83cf2808
pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 16968 bytes
font_02_sfnt_off00014257.bin
a4cf474a355bfa6af0db12d76e3d1a4aa4122185acc2001fe35c0c2507690535
pdf-font-stream PDF embedded font (sfnt) at offset 0x14257 10576 bytes