Malicious PDF — malware analysis report

Static analysis result for SHA-256 9116a42468c8a363…

MALICIOUS

PDF

97.1 KB Created: 2021-06-14 23:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4be5ba0524b160657c4816ea0862afdc SHA-1: ae2cbbd06d17287dc57ba8071802f555a0fd35ac SHA-256: 9116a42468c8a363b8c4c4d5431c2f9a60122dfc09e43e07c7a0a672afc944ad
154 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI references and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8116

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://ketchas.ru/uplcv?utm_term=exodus+18+kjv PDF link annotation
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/05op0p4sjrlcbqumj2odgq5jsk/zidetokanitukuponomudor.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/gajojakis.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/ximaguzitaxitotu.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/20099702413.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/nekaseb.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/ravimuserelitewikosulige.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/74424530670.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/drh5frq0pukafrlm34kt8thtr4/zizabududoluxa.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a415abdd561---nidilivivitidalewov.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kikobibedabivumulug.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/97162743527.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/njtvhk701ajmdfg1rkcgcj4lgt/rapiwumak.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/vj6h9bgo4o2bv46bsvc65jd6kh/dibugunifivumusa.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/qol87ffplhgiodcni6lamksgui/1606282723.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1b2ab60c1012fc18c4309ccd610f4c0f/xibubego.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/21689858362.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c207c9059bb---tapevetevosep.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_off0001694f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1694F 4952 bytes
SHA-256: 4413b51356c43495f0d8f4330076578729baeb17173be0a5d8c643a13ccad536

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