Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3052cb2d070590c…

MALICIOUS

PDF

53.5 KB Created: 2021-09-25 11:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ebd9d31ee1f1e1ee2d60f105d57b1798 SHA-1: 2679b592fbee5e6072041fbef7672f250c9f8def SHA-256: d3052cb2d070590c24810580a33519272dfe93b9f5eaae0ef9dd44b62fd05833
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and ML classifiers. It contains numerous external URLs, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. The PDF's structure and embedded URLs indicate it's designed to redirect users to potentially malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8359

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=coordinate+plane+graphing+pictures PDF link annotation
    • http://detskypohar.cz/upload/file/97781017942.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/voxogerotakan.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b55b77bc8f---99051350728.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/49306593002.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021091104430273499.pdfIn PDF document text
    • https://dm288.rs/slicice/file/gawuwulapuguwix.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210903104809200.pdfIn PDF document text
    • https://renteci.com/imagens/file/32058987986.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/66768471124.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/razakibelabagazomegus.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/77602614759.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/79634375840.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/dumotixosubajale.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/19a1dc16e39994b6c17dbe5f6a9da8f1/16931532198.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/4n4l2g5uboo5t87estdgl7ctgh/bojonabexumobuva.pdfIn PDF document text
    • http://yuha.be/_files/file/40771696503.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/23262295706.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/41504341676.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469f29dd658---xujalevafugegafibexebaru.pdfIn PDF document text
    • http://effekt-film.de/files/file/nudopobuluxijek.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/favikepijuvakof.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c0680a8834c9765cac1358f772e6539e/26149176311.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF47 16348 bytes
SHA-256: d84acb532957863b40f59ec7336a63de3191ad7bc4d01c064db39abf5d956870

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