Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2535ee045b4f83a…

MALICIOUS

PDF

69.7 KB Created: 2021-06-21 04:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: cdfc954a91079ee2a3ef457ed31ea540 SHA-1: 98b9d4b7c7369136c6d6a441451b39bee9222d70 SHA-256: a2535ee045b4f83a68e404e7f8973d8cb752e4f1ee21ac2dbb161f73a10ee401
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains a link farm with numerous URLs pointing to potentially compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious files or conduct phishing. The document body, though heavily obfuscated, contains references to movie titles and application names, likely as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://aaaexpressac.com/userfiles/file/98709391915.pdf In PDF document text
    • http://adria-ex.com/images/blog//file/37165984675.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/n90d5j3an7ui9cov5v1thk17de/15302727015.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/83129493912.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/tugpvcalrs0ph3m4admubshe93/maditafevamigixow.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16087938388655---sunuwinimaluxatiwupujuko.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609943ffdfb23---sirixabawovakigopi.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/tamamokajafovabo.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb72f25933---8306808844.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b73ac8c414d---99023418756.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/b0adapcr44oivarpj94j65mi73/gakifoduzobolilafoma.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/pufuj.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfafb4b9f88---vaxogowozezokejopariwalet.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d9832f71e---71275528485.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/3aa491a6632355be3b8e8ebfd9918385/mosinaroru.pdfIn PDF document text
    • http://salkim.com/userfiles/file/lubewibudevumipazorido.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/tbv5j8geeb6t2asdmr3sfo8dc8/zavedukekad.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/87042697159.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b29dae1f28---xezakifumizupisonowegode.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/edbb6eda1eb6bb0e4426c22ec6cb401a/20431476935.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=agneepath+watch+full+movie+onlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A5 5176 bytes
SHA-256: 1f4ce56887d36ec673a877afbcc72f06eb8ce509c5749ea8695ae280cfc2388f
font_01_sfnt_off0000d73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 10452 bytes
SHA-256: 4b2e516b0d741d5bf3fed59fda29e4259d695b60a94216c798f1631a2995ac15
font_02_sfnt_off0000fad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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