Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc03909449bf1e1…

MALICIOUS

PDF

89.3 KB Created: 2021-09-18 01:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa2cb7ab1719db2ae5175e2c7f6e6e24 SHA-1: bd904c3c5606659075c5bec9382f4747c40b2c7c SHA-256: 3bc03909449bf1e19ce47c046d29f036062870b1e6887052ecbb9c02de33aac0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farms pointing to various domains, many of which appear to be compromised or disposable hosting. The primary function seems to be redirecting users through these links, likely to phishing pages or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=swords+and+sandals+3+y8 PDF link annotation
    • https://ev-owners.jp/userfiles/files/walor.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/kokopaguwepulixafe.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/xulanuboxozi.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/52634301942.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/wubija.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/tufixolekometukiziwidudan.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433f5647a14---54268134567.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/tubavudopufadelunodedebu.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210907080115.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/fusogofofaxojakov.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/87134065537.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136f135a687e---jowopus.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613173e25e30b---kofixavobiteva.pdfIn PDF document text
    • http://contelex.it/userfiles/files/sunupim.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/12645996312.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/85298078315.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/58775759233.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/fobesewibokad.pdfIn PDF document text
    • http://geasit.it/userfiles/files/mawofekanodali.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630713693.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/83502097447.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a7b38985a40646c23d9513681994e396/41880378492.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/2912099000.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/fejopixane.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_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A6 22208 bytes
SHA-256: 04fa3c86eb1b5adf497a52cfdfa3fa17a0cc72f8b1b92d1d5f748f0e14e07eb4
font_02_sfnt_off00013f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2E 10576 bytes
SHA-256: bb812d4c511822b1727a6e4f47dca55f714018796fb1c512b79cf79eb99360c6