Malicious PDF — malware analysis report

Static analysis result for SHA-256 237b4244cafe2d77…

MALICIOUS

PDF

98.8 KB Created: 2021-06-29 15:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c66d2e38dc7f51be8bf6b6c182260fc3 SHA-1: 473c86801e493fc12372035f1c7ba70fb00977e1 SHA-256: 237b4244cafe2d77f9a9219545c376fd54167df8e68886a4eb771d0ac04becaf
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2eeafcd361---zulebigazasataruz.pdf In PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/e41c16dea00bdfd20ae5a2c901539eac/fipidowigi.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088862227a73---dipadoxatiwut.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/nozafodipuvijurud.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9208542e5ea74c645ebb6e239e33160c/58414244806.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16079829810147---zawaxum.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/7974298117.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/2209938483.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/19331386427.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/37b781c31b37c19005e159eb2c6a78fe/43444122198.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/20708751779.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/suritepobupanugegazikimo.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe9ad230e3---64673806893.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429141640484031.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/95977509293.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/fc545e7551e07ef8748471060912ccd9/75558976201.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cebce313920---48434393954.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f3e246567---43037716782.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/borovasifewowubigit.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/mupimepoferuve.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/7ffa207c90aa274e1fdc85551bfbc70e/vexataxadaxole.pdfIn PDF document text
    • http://hasyo.net/files/file/79545155760.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72ce7a2d94---30359026382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=find+the+area+of+an+isosceles+triangle+with+perimeter+36+cm+and+base+16+cmPDF 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_off00011276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11276 21232 bytes
SHA-256: 8ecf2cdca49df7a74ddd6b487a972174ac03cf9ee02104cdfe92d6fbf223ac1f
font_01_sfnt_off00014a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16221 11664 bytes
SHA-256: 970c366f5b7dfc00859ea06eb082f534e9ddb0e3df6c01cc483d402e9b0c2146

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