Malicious PDF — malware analysis report

Static analysis result for SHA-256 3937955cea0ba6db…

MALICIOUS

PDF

65.2 KB Created: 2021-06-17 19:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bb13bed04b72d844a479ea32314fa7af SHA-1: e3d4af3c57e988cc9eaed4eb27c0cd581ed69c87 SHA-256: 3937955cea0ba6dbe17b485273d1144f727bb408efb93417a23497414cb7282f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=pdf+to+musescore+converter+online PDF link annotation
    • http://sevoir.hu/uploads/file/bijabiwikoxomisu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d562317218---88373450943.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d1622a243---38477923894.pdfIn PDF document text
    • http://email-database.info/userfiles/file/10683397387.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc5045624---nebexele.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/683f7654e972ae04a4aaaf34c5e67928/suxagogemizaxexadaki.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/03a6a7178f58f2b011b167b134393c35/95129196835.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8e6c98fd2---70769385884.pdfIn PDF document text
    • http://maydangson.com/vietkiendo/upload/file/21611720428.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/29095220336.pdfIn PDF document text
    • http://2440027.ru/upload/file/2516021323.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/038d9e3de55e1a76fabe4edb6ce1cdd2/kokuzakeluj.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086091429240---bubovugodudito.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/47980254783.pdfIn PDF document text
    • https://cristalensi.com/public/File/topudexisugiwawo.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/c36c0794f5384465430a3d827c88b093/makafanarukinarukeb.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbef0cbfa2---wunadenizanowomekirupido.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d62560bc59---26159780133.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AE 5020 bytes
SHA-256: e6d1af174c343277d6d3e86e5a4d01a3f91eabab23320f86b32cb1006a7b4858
font_01_sfnt_off0000d4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BA 10404 bytes
SHA-256: 1fa77d0f3e14d94b1361078539d378cf4a9222b7d0b9e424d3a7566e5a88d3a3