Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe52fffd7c4d687d…

MALICIOUS

PDF

88.1 KB Created: 2021-07-06 09:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 13fa69f4f8c2744abe2eb66ae1ec7dbe SHA-1: b73f856da15738fe414efb6a52427a545e6fc915 SHA-256: fe52fffd7c4d687df8372f2f4a82c34915709b1fee20339b41835d30fb9fe1c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised websites, which is a common tactic for phishing or SEO spam. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=what+to+write+in+a+cv PDF link annotation
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf140507d---97196683502.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/jarikizixufajaxaweg.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e0e7cfef47c3511fc13460883d85c19d/7230184470.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/64fbdfbfe03aecfa44a007c0d756fb83/favizerijax.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/67860429993.pdfIn PDF document text
    • http://majorsagilekvaros.hu/uploads/file/rotupe.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/xuvumuzevefesopotaredapu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2d990bea---16803968994.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ac50e9b73bc276410bb4445689954d5d/xisibif.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/9be3743e2a96114305e5a548f0c5bc5d/79141714047.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d5219d204---41140653212.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb482d1c075---20880544437.pdfIn PDF document text
    • http://darec.sk/files/files/405724947.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/mebuxijoparijapaparux.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160923ccaef97c---xirox.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/344523ccbc1e55c61b382d4ec8f14706/sifepudumoruwo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/78653629062.pdfIn PDF document text
    • http://dgjst.com/upfile/file/muvufusomuzelaxugotopexax.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf1b1debe---saduwifu.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/sarirajoge.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94816252f---94892276494.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/09da310bee3ec43f448fcfeabd021356/pefavupus.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/jcvcns1lp8sjl5sndvds4dpesp/39198360118.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/jipiwosuvowuvuneg.pdfIn PDF document text
    • 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_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 17536 bytes
SHA-256: 01d1cd30e3939449cb4b1851f535e791adce8ecba5f94e5021e78d2e4c996021
font_01_sfnt_off00012416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2D 10260 bytes
SHA-256: 7a4db7002787af8fbe6a1a25e73edeb227f132e3bf1e6fa65c33c427c97d7b75

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