Malicious PDF — malware analysis report

Static analysis result for SHA-256 185928cd296b4663…

MALICIOUS

PDF

81.5 KB Created: 2021-08-15 22:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d9c2f8b383ca20efbec53d8bcb5b1ae SHA-1: f3d16cf690a3157dd53db2b8b39ec17806f592a8 SHA-256: 185928cd296b466398f84e160479b8b96826df107cf3bef587c2df14e7993887
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a link farm hosted on a compromised WordPress site, which is a common tactic for distributing malware or leading users to phishing sites. The presence of multiple links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d962ca3e7b3---78753741567.pdf In PDF document text
    • http://tataservice.it/userfiles/file/pejulavowesojewuzinevaxu.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/46234831183.pdfIn PDF document text
    • http://mesterek.net/tmp/90498852757.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/5d1b309dae88e4e612b191b02991690f/40714335186.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/83149684122.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/87659909281.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/15009630670.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/tosazosafox.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91c1610d9---41935056408.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/2329754577.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/50398496606.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/79b749643342ded3b13577d8006253be/denekonevexasibino.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c5b9cc4af---tazivimejikaxemegalimivog.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609633f5b70fd---movesolovalipeb.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/werasedawezuvuwizifoji.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b493cae6---17180682676.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/13832662943.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/jelanuku.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/oi3s77pn1qep8p1ph739mi99tn/sunupolalepelesadulotib.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/43702052246.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/83821135518.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/nited.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/1709978451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mrua+ejercicios+resueltos+facilesPDF 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_off0000db07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 10448 bytes
SHA-256: 512c5a929d833b0f28b811a879e80c01f465f098f068f4beb507d015400fc0f8
font_02_sfnt_off00010af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 16920 bytes
SHA-256: 9668b9f0da21b6980180e62ddcd18da7004aa6297b4197d2f0fd8ce821bd2094

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