Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28ea71bbd78e708…

MALICIOUS

PDF

84.5 KB Created: 2021-07-05 11:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 87bb80d498c76d6797d32257614fbf68 SHA-1: 26e57cf52f152370e800f101096eecb1645e3b5b SHA-256: c28ea71bbd78e708b0e4552bec5d8f7a79a743976f25e44083df6f4d4572bbbd
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple websites, many of which are hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://gfow.om/wp-content/plugins/super-forms/uploads/php/files/q550pu7knj2gqvsq69qpfcei7p/zujumafenifazaniweniw.pdf In PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/348519c0737c5f7ecbc6375988b3b5df/vakugu.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/powejakokekelizi.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/bevijuzana.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/17014972743.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082869e303b2---wazanef.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/c315d550c4ae7fcae3cbdfca5b193e01/54437008897.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/1b4c2fe54f2de262c8eeba66d52266ec/3465451250.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a30ccd81---paxokemolunebenowezelozag.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb57864bf94---59072297609.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c37108d6c7e---temikonotexama.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/69822189985.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/pp3s28abti005hc6e33gpg17u4/nutojakagaleji.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5ce8d4a77---fuxuzuvusuzugidapose.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/89a4d128e21ffaa4152efef032209a54/85937478664.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/39545970768.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ipgsc34r7scgem2v66i2pn0sqq/vikumokexuxogelapipedil.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/fafenujerarum.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/runoziganazugigepizefus.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/8d9047610ad8e83e2b02cf9bddd1027f/48212255756.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/235107207.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d328aa1f9aaf5bcc720bd23511579687/83319061476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=wave+erosional+featuresPDF 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_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 10364 bytes
SHA-256: 8154d38d2ea92e5f8b70abe830b5e7bfeda5ae99ea63965919e4f5adca12a328
font_01_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 17228 bytes
SHA-256: 2ca7de9d6cb6065928eec53715b328953421a7ea9bc136c401ee5a2625639202
font_02_sfnt_off00012cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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