Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e70a9b383a530e…

MALICIOUS

PDF

71.3 KB Created: 2021-10-11 19:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b27cb21f9fd36c773a77b52e423489c9 SHA-1: 86b385267d635311cef40d11b61ed9d358360d12 SHA-256: 73e70a9b383a530ea42deba66b11e37329dd1b63504230b156170d86d640683e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=dualshock+3+controller+on+pc
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1616412460a28d---vaxamoz.pdf
    • http://hastensandbreakfast.nl/userfiles/file/lilemolazutaxugovotagegot.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/6454053037.pdf
    • http://ilink.pl/userfiles/file/43448641998.pdf
    • https://verandapattaya.com/userfiles/files/keritijosizokunegosifafol.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161422a79c46d7---84205433948.pdf
    • https://soudurelausiere.ca/upload/editor/file/zesezexe.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/69e132c2129b92660c9ba9527c7ea6c4/lazanoxi.pdf
    • http://tradotel-riviera.com/file/61778676154.pdf
    • https://salwangurugram.com/files/kazejezaxozujobowoju.pdf
    • http://mynigaoe.com/upload/file/20211011091231.pdf
    • http://bellamy.tw/uploads/files/202109121517402628.pdf
    • http://abacusnancy.com/userfiles/file/67629050687.pdf
    • https://bushregenerators.info/userfiles/files/laxajisodilupena.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/0sddgeljk48sqenh33669970ra/zilati.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152a99adea1e---67492358767.pdf
    • http://matemotors.com/userfiles/file/44647077485.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/lobuzasaji.pdf
    • http://dakhoanhanai.com/images/files/28300787480.pdf
    • http://bdsps.org/slbdavbatala/userfiles/file/vufetikogixira.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/60947752072.pdf
    • http://dolphinegypt.net/userfiles/file/63960710115.pdf
    • http://china-engine.net/ckfinder/userfiles/files/wurelujax.pdf
    • https://wilde-signs.com/media/70786479758.pdf
    • http://zensushialiso.com/uploads/files/41728601377.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4ed.bin
64e084dd9a63613d2106a9cf9cbc52ad008d62161341bf076d7e0c667409629e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4ED 16496 bytes
font_01_sfnt_off0000def9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 16792 bytes
font_02_sfnt_off0000f710.bin
c21adced50f7d2c9807d5f3ff414ee8bdca05cb9504a84c372786b7c155c13d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 10744 bytes