Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc79c08846856c2…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 17:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 24fb1f1dcbca7bde08052f625eac2958 SHA-1: c38d37a3101bd1272b69473ceb38de57e778e162 SHA-256: bfc79c08846856c2db0b24c2fdfda177fe1ec54e31086e810218b7ff4e0f26f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=best+fishing+games+on+android PDF link annotation
    • http://chochosanencino.com/uploads/files/lopukefazi.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161319ced4c75b---52308778928.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/58100336267.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/72847510910.pdfIn PDF document text
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/punixuzivenop.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/38325004109.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/12fcd36e7277d5f2fa0cf404947993b6/5679030071.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/60450871409.pdfIn PDF document text
    • http://sergeybazarov.ru/file/80672776446.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/0a9608e14ae66e58112ffef90ab7a8bc/42883139696.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c7712580df21873e152a7b1e63f21cbe/39546493789.pdfIn PDF document text
    • https://tdfstore.it/file/17146412561.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/rusobafovareku.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/zesenodarepegenu.pdfIn PDF document text
    • http://soc-in.com/data/media/files/xakopi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2648d63e3d11926e7da0ffa2e76f066f/82113315722.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147bdffe8bd1.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/40604901167.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/ponogazugovozoditirarota.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613da2863f3d8.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bepoxeduxupovarog.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a08b8f219---69754878519.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/73182234658.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 10808 bytes
SHA-256: 2142881a5b69c081cfaf39cd6b0c9051ff249549d33eddca7da7434f04254318
font_01_sfnt_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 17096 bytes
SHA-256: c7037b5efb923ce8f8937065be2ed79e93a75ebdf2e03845025972d5ee20033f
font_02_sfnt_off000130bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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