Malicious PDF — malware analysis report

Static analysis result for SHA-256 42601cf9a9e94e70…

MALICIOUS

PDF

67.9 KB Created: 2021-06-11 14:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1c9bf43a4368a9c8b9ced78e5437a4ea SHA-1: db43afc7cb6abf063b590d219052eda5482e6e36 SHA-256: 42601cf9a9e94e705d906089c260a985ffe603f65f896b13c7348ad3a9a281a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution attempt. It contains numerous links pointing to compromised WordPress sites and other domains, likely serving as a link farm to distribute malicious content. The presence of external URIs and compromised CMS upload links strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

Heuristics 5

  • 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
  • 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://smidgel.ru/uplcv?utm_term=saxon+math+course+3+test+16a PDF link annotation
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/78bf0e49ce7158be3cade5e5041d1ddb/vovebomowewavilag.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/u4t3sp3uai3gfb3sjlgdb5k7o5/bamavazirodidofoxuzevupob.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210528150610.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c4e03d465---91069251350.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/83555604919.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/91150821474.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a06c49ad14---gogezot.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/5247b7b20747ccad08f67349d1a17d42/92146757371.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/lmas90igukto1qllg4c5i67ai6/49870144533.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/28282411951.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071a73f28c32---91270168656.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/9d3881a66d30b973d4b6a1d174769a17/pufufusafafelim.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/bolugel.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab90d52963f---rinemolizomodufiwub.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/it73b1mkg7fl5d5kvn9sfpdgl2/gigukuvebiduxozuxafimepo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081767ed7237---90804198377.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 5548 bytes
SHA-256: 55a4c41e0823bcead140dfe3a7339a65008825b66846fb65e26c4d5d75d80188

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