Malicious PDF — malware analysis report

Static analysis result for SHA-256 645d95162abadbfb…

MALICIOUS

PDF

73.8 KB Created: 2021-06-22 14:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e1fb0e2e722dd42144b268b3996faaf SHA-1: 11ff74b143cd71ed43c08a29080d884210fbbe95 SHA-256: 645d95162abadbfb8d73834ef22bfa70b0e8cee1e050d0271ce8a9c6f77515d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the primary goal is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=2+bhk+simple+house+layout+plan
    • http://afgventuregroup.com/cfiles/file/89321653721.pdf
    • https://meesens.be/KrMee/Tekstverwerker/tefegasidotabiluwareze.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a46098bee---vibusugub.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160774a46b2874---sofimodasezaxeweg.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/9ab44bf3a94c4e48fcf983fe8181b4ae/58434697756.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/43052958305.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/b6def05875a77677a20082a919f7dca9/gibuz.pdf
    • https://unicon-msk.ru/data/files/fopubererova.pdf
    • http://xycrusher.com/d/files/64153185874.pdf
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/xufukoxekusinekeloromota.pdf
    • https://torbay.ru/images/uploads/file/kojotesimiked.pdf
    • http://eaas-journal.org/survey/userfiles/files/sejafexuvofil.pdf
    • http://alhouti.com/userfiles/file/53995151407.pdf
    • https://machnhaduong.com/images/uploads/files/1796121299.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0b1bc14e---dasumubemak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e340.bin
3896e92399832a7f30a404204bc5a875d8baf2abe7541e9637ff7d59feb0e0fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 5304 bytes
font_01_sfnt_off0000f525.bin
f0c73a2c3b18e693a52b1c0308ede676669e56429341c06f70c77bb72b66c1e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 10824 bytes

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