Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3dcec96155661d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 07:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 58e94bf4dacc43bc09b56d0af58b702c SHA-1: 85a069d7d85f89346aad11c8cc4fd80bb79c0ede SHA-256: 2b3dcec96155661d9e2463fd97959f3dc2bf2c47fc1bd6d82c6ef6a86a776305
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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
  • 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://drafthe.ru/uplcv?utm_term=217800+sq+ft+to+acres PDF link annotation
    • http://generaltubi.com/container/ckfiles/files/fagobikowujijimuwevot.pdfIn PDF document text
    • https://wrd13.com/force/file/11885260849.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/14729132637.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e25737cca---duwumulivurema.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/kufuse.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/teruvolu.pdfIn PDF document text
    • http://yepuco.com/uploads/files/70282888730.pdfIn PDF document text
    • http://candientushinko.com/images/file/lupubulomiginixejaxori.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3d4e23f07---5768808448.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a052010c37e---52972492897.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/gaxiwufujepibo.pdfIn PDF document text
    • https://soechi.id/userfiles/file/17363974623.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1930782a24198e148d659d2a4386a379/nonegemibezazorelot.pdfIn PDF document text
    • http://asfalon.com/__files/file/22207191058.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/45006513807.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/64923527920.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/55679924789.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/541854d15ae7999b0564bb6bec577e36/21877981474.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/98671447503.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2bbd27f4---42163111470.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/zomenosopemifu.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6st30nal9i6cv49opkhhuh1rkc/96081466659.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/keboxaxowogojapekurotexoj.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/62854884497.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/72635277969.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_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 19212 bytes
SHA-256: 30405d7ed6126869219751c3353d4a36ec7fe950b634e07ddaa6b1b601f1ee3f
font_01_sfnt_off00010fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BB 10688 bytes
SHA-256: 086e7b83af12ecf0b91d8fa8a6bbf82110fde9dbf827fd8a55c9e846f7ef168e

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