Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c895a6e304d19e…

MALICIOUS

PDF

74.3 KB Created: 2021-09-07 04:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a6a0404f0739be588f3d28bfddb3edbd SHA-1: b50e4141e4ddfd0a3207963314bf627d626a2ae5 SHA-256: a8c895a6e304d19ed418b2cdcd298c098f52d21990392b6ca949f9a6de3274f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the overall structure strongly suggest it is designed to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pixomot.ru/uplcv?utm_term=rationale+zahlen+textaufgaben+pdf PDF link annotation
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784410089f6---94345183539.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086badfd28fc---jotowetupudukadavuvej.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607170bd3475a---11511424370.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/54737969853.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/29236498081.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/99f8d3c5847fe5b93d96343067b35d87/56591218401.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/kipepe.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3949280a2d171fc07cecc0e7fbe8fb72/19828534083.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160998e3f5104d---xosaput.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/mamopudode.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/93d876297fff2a08e7930f816116aa51/zutawelizojam.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/sugemomegi.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/xarepudupejon.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/95592667392.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/76969837667.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/davemoferakugafusuvoziwip.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/52334455379.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/qipmo79oog6u6j0ucp6iupbkhb/50092299625.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/14305869199.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aa101b7ba---68288221098.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6fe6975b6---4964362010.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/77119853105.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_off0000bb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD376 18576 bytes
SHA-256: f6dab6d56641f56e5783c84c5c85e559cba57429ccca57972d010010f95d9930
font_02_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 10956 bytes
SHA-256: 4139bb0edb8a8da8a6d58e325c35fe0d2a8e4cf4e764c0f554e31f0094292bdc

Open this report in the interactive analyzer, or submit your own file for analysis.