Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf14a171585c856c…

MALICIOUS

PDF

89.1 KB Created: 2021-06-25 23:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: cda8d7711a395cca900aaaabd688c3b1 SHA-1: 406b13aaa7d4a88db6e4846ef1ef668cf3aecc75 SHA-256: cf14a171585c856cc5fa4e34a1b34401467e1ae1a9938f6b73472294d8ecf367
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://kulturazebrak.cz/userfiles/molezit.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d8ca64767328e1473579bd3aa908d57a/kidukukubesoxox.pdfIn PDF document text
    • http://alkanboya.com/files/file///wizitusubelolub.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/180d5f5c46be23194b3507bcd5094af3/64835971126.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/oi36ofqn50pefpkkrmqlh852rl/fawatabora.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/ragiwibokupinit.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/fowaxazunuwekenesa.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855b7d046be---sepeweligaxud.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071be1405112---35582412032.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef77e5153---notejorunebavezetuximu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d77a9da71---xobireg.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/15391085380.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/dc69f1d02421444b17c6b1512bb14315/12556243781.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/301197d9f629c0b7d8513c8474be8707/83032460117.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb95fcbd3d---48345373090.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160add8810665b---97011363233.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/xevuwine.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/87604139729.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/29116aa49fa112efd1bb2822db4e7d5f/golezajigomosapowikub.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/48455867378.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160bc71834ee4e---rotujupewusetubutomon.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2c4fc50dccf5f3ed756e1dc853d3e45a/68860837708.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/71621510687.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d899c79d---66509549262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=textbook+of+functional+analysis+a+problem+oriented+approach+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_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F12 17476 bytes
SHA-256: 605abe9c04635019012e26ddfcd47d41448353fb52d45afee070f73c5956c844
font_02_sfnt_off00013c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3F 11396 bytes
SHA-256: f3a80a61ed21a91ccaceba06c3577ad98105912ff424186f0ecc5c1476fe0bc6

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