Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb91e51eb865cc0b…

MALICIOUS

PDF

122.4 KB Created: 2021-07-01 14:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 5607bb6c8a2db81dec466fb2ef58eb81 SHA-1: 9f3c854ac0915447685bb3e299b407bb244394e7 SHA-256: cb91e51eb865cc0b8bced986ae7102694204f63b02449f4d61d3ad863f87979b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links suggest it is designed to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

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://crysiq.ru/uplcv?utm_term=the+three+body+problem+chinese PDF link annotation
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160db259625bc7---digimupolimekaxiw.pdfIn PDF document text
    • http://yoron.net/up/files/nepimedimake.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160759064ae6bc---vuneredapoxiv.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bnklqv7accblgmr2lns5a0m6i4/75736055509.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/608b3e40b003715c292626a6a0049076/tanifidowugirija.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077c8f91226f---kagal.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bab130aeab0---64201131039.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ad8d6e2fc---40282994497.pdfIn PDF document text
    • http://jucal.es/images/file/votul.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/6osjisorfbduvkg2hilupssbh5/soxewoz.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-8/20210508171706851475.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16085dd1d485e5---delemogejogetukosotiruso.pdfIn PDF document text
    • https://davaocarrental.com/images/file/42950474728.pdfIn PDF document text
    • http://falerisztika.hu/tmp/67157587952.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebbbd39d61---nowivupatowifevukesu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607838e9c67be---bafokigemikipedefizajivo.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608641f5bfc21---8842658006.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ade28eb12---vilevomilopuwelamotepoba.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/qkkmaij9pkm8qtsbsbqr0lgu5t/rusepogezifozete.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/vilowarezukatutigi.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/8d6f2bc30c6e4998a1518c16dc39e53c/robazeruvax.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac11a96d1c3---9514905775.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16086560684eb5---jusixited.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/52894678573.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/59d51e14d862316723a084cfd5921cef/89005625697.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/niferetele.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14674 22528 bytes
SHA-256: 1ee2a1952686c6189264d339bf3221f3deb3ab71a8cfc009b798ea7fc306b35f
font_02_sfnt_off000185c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185C5 10836 bytes
SHA-256: 4a67aa91b0e5d9b40904f533c38310892cafd20f9d8046ef223466657d8b4aa4
font_03_sfnt_off00019e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E55 25136 bytes
SHA-256: 1983496d87c3d78b30b96a228e0e24812078a2015b242479d3654b7fc01b6018

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