Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d17d846313131ee…

MALICIOUS

PDF

88.8 KB Created: 2021-08-07 13:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3e93d4fb6456617358712783f3b6ac9 SHA-1: 2bcceb9dcb1fcda37fa1557b49cdd2d67e647245 SHA-256: 9d17d846313131eec4a8d02b42dddc7b885984a3dd141531a4dd95e0e64dda82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to other PDF files hosted on compromised WordPress sites, 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 0.9987

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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/61e195a6b4483b3beab1296743a4afd2/tajogafipiwibabakawar.pdf In PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/bapowiselidazogevozodi.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a4b28ab7c08e826412b6ba3cc1103f30/demivonokarubaw.pdfIn PDF document text
    • http://falconltd.pl/cache/file/vadum.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ac5fc304d6dd81e2f6ee1b52d5388f78/sajukaxadolekovurof.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/36905661635.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c11d257f8---25995025663.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/44679067095.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/61495234657.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7qsilultpv8sd7rkm9sat4uddi/putonorukoxaxoravajadaja.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/27604483223.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/nofesetubizisigu.pdfIn PDF document text
    • http://teifsepahan.com/files/file/gasubewutorejilusofes.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/eb664b7a2850565c82075bd4aae96fb4/zomataxanemimonixijiw.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/3884977580.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/9f68b52c8d88e7ee322beac56ee1d453/54074819024.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/bulurusalejutafet.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607243465e06d---57051515640.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ub1t788s0mls5vgkikufjb8qnl/wiwurozanuvuxuraferaki.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/lijurujulavumoxufamilena.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/2616817723.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/37cd077e852d0a776bf77639643dd455/86256087134.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/8bd632b28ab861985c3293528d363a7a/xalap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=best+build+for+paladin+neverwinterPDF 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://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_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 17324 bytes
SHA-256: 47e9e294908ca0ff7d49e743aab5f78dc7490edbc9e39f21dca9000e28973a8d
font_01_sfnt_off0001237b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237B 10936 bytes
SHA-256: 62a4f9e7197ffe0d269d8dcdfd24e50eefb8570381478c6df505353cb5f83cba
font_02_sfnt_off00013ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1