Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f6e03a0c7fc3e7…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 15:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a41258abfd00202299b5c9d07640f2f SHA-1: a3c22961542f36719cf061f940b81fccf92f2b99 SHA-256: 80f6e03a0c7fc3e739ed141e9f3229838c12916294658435cb4aa9f1d09cd09e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://color-gateway.com/userfiles/file/xafozemiriwo.pdf In PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/53086750714.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/76499574605.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/wonuvolojijusaligisava.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607921f233abb---mekaxuteduwe.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a876d9ff0d234959764cbdfd459ebb27/86610285916.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/zivuzo.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070106044184.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f6ecf266825---14423530421.pdfIn PDF document text
    • http://billsky.ee/files/file/64658172143.pdfIn PDF document text
    • http://usmleworkout.com/files/file/pudaparopev.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/referidudapitimopaj.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b936694fa0f---60828968751.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd5630b3f3---23961755063.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h4q4jlr465s1nvr39fj98te262/podexata.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/52149845807.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/pojanolerojewo.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d84eb0934---varipofelas.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/30379215861.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16090c7a49069e---zalapufuwot.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/27275213066.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/13285919619.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a71769b0efe---27712161069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=most+commonly+used+collocations+in+english+pdfPDF 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_off0000d723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD723 18228 bytes
SHA-256: 370ccc8e23ee9f5703df2a3d551ed711ba434d7224228dccdc4ee29d3105baac
font_01_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DED 11176 bytes
SHA-256: 24beb7d4b4e38cc360d78f48b8765bec1c4f2206986e834278db85b7fb150c7d

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