Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a900ff203a2c538…

MALICIOUS

PDF

86.1 KB Created: 2021-08-16 09:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ede6009701fe0783a402f8e4f6b00a40 SHA-1: 706b326e889b29f719fea5ebe77431f07e6efe1a SHA-256: 6a900ff203a2c538fc93f84cd13fcbe223b15ea5af75f7b0111729c4c9129352
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=real+car+parking+3d+game+apk+download PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3d739fa8.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/11176214417.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d14c0247c---46694760541.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/retukisilot.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886b1bed071---89705344900.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/82090920595.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/79654246148.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba87447804---dijuw.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/kerejavenerube.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/fojewumoduparudivava.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210728100152_3w4n4r.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a3nooc4e7lkfg5aseh1aeg9736/timate.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/9a6abrkr0pv3g6655jvjvaatp5/womadobuxusuwom.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/guvenenakunujemofeloj.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ea7a32add76c0c6dc7043edfdde2f37/95471877815.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/dalepamifonumu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/dkjbnmechke9221e4a2eacgvfb/60797914880.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/wubisijifu.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000cfcd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCFCD 17800 bytes
SHA-256: 836c8bfa948b55cac9fcc735e65baad05e89d61749d76fc62135a40e080a9196
font_01_sfnt_off0000eb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB64 18572 bytes
SHA-256: ea1c9391c82c0af496d5a854ece3a86c6c0b34e6ae559c3ffc4e8e10720d9c98
font_02_sfnt_off00011965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11965 10988 bytes
SHA-256: 4ecb78185e8b1bd09b3ec9ee7f2bab3eaaf7540061908ed40286905f78c72dc1
font_03_sfnt_off000132b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1