Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f62cfe9d2ee332b…

MALICIOUS

PDF

94.1 KB Created: 2021-06-19 07:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3b81a91cb96b9ee81b4b43c13e3c1dfa SHA-1: 632183045858c601b980d206be13177691956785 SHA-256: 8f62cfe9d2ee332b4debc41ea456a72320f3980bbc4dabc49282f0a03de095c0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. The document body is heavily obfuscated, but the presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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 https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e8fe2eb111ad6e691e8374a3ac5cb344/vedakotalusi.pdf In PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607d12c762a91---55244725819.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/lofemokewoxuxedi.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/d38c4985220aa81323de610dd29febb8/pibexafusufofevas.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/aad22c80566148bb2ed3a923390d2c76/noxumodesuxuz.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160af9cf179849---lonunubaganodebifa.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/92adca0a66759ae100673dea411b3018/vilitomivazex.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/8e6bb2310ef67fd852dab9a4cc7be84a/timokeribokutu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2ebf8162f---27936500467.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/u9o8rr7aieamgnlpkkovn0skhj/66815380791.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/8s53qk932fcbh01v77o2gi1phb/wifixebodibe.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/74446340208.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085931735f01---64390177493.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/3fb5f934739972385b69bc6365e8deb0/63548494526.pdfIn PDF document text
    • https://luminex.pl/upload/file/dojix.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/wewazolilikiririluto.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/gijomexiwuz.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/4jbkjaii5a473qqmivv18lhhju/44859349238.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mk11+spawn+skins+unlockPDF 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_off00012414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12414 3292 bytes
SHA-256: 67957ecbd1f1323cc4032f1f727d6d849f6ee4fec5c436b5f81de8a3ed363b0e
font_01_sfnt_off00012feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEB 5044 bytes
SHA-256: 48e585c0461a459834ee3c8ff0e41f60df34a06d793e66d1817443815426990b
font_02_sfnt_off00014153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14153 12384 bytes
SHA-256: 47e71fd1ef1b242b6f76a4d15bf984f2e84bdca110d0f8742f7b12f83d543680

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