Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4c2bf1236030d4…

MALICIOUS

PDF

88.0 KB Created: 2021-10-13 08:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 652155675d8148ecbf208c9e9a37f82f SHA-1: dfc42956173b41cab05b6050f9217da3ff3ebea9 SHA-256: 3c4c2bf1236030d427ca80ea0f67c89b7eb42ac73d8c27bd01e2e34aa9616dca
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, several of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and compromised CMS uploads suggests a multi-stage attack leveraging potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://art4you.sk/editor_uploads/system/files/kaxojapan.pdf In PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/warudefopijagonano.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/uhhg26a11hi2cs2o12f2golcgg/89131064791.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/venomulamukurutuvimo.pdfIn PDF document text
    • https://chimrodistribution.ro/poze_diverse/file/xefediwidosunujawa.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/46439418409.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/54453852171.pdfIn PDF document text
    • https://bselink.com/userfiles/file/61023223832.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/cd2fa8808235bf2732fc3c43f63601dd/68291964231.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/nodipene.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/domesusokusegivuzapum.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/jasegavure.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/30766760987.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b8c1b804c---12536534548.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9878d0d917ce6bba9a1b1deefdd2ca17/73272203872.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/pijoviju.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_10_13_59_10_3399.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/55449812160.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/61981335912.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/wanagezanugujifikidag.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TxADE9PCSUw/uplcv?utm_term=tyler+perry%27s+for+better+or+worsePDF link annotation
    • 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_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 10328 bytes
SHA-256: 1b1cbc8e45fae49ea2d98909380b9132ccdfd4257efd4f93c598ec6fc1a7871c
font_01_sfnt_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 18532 bytes
SHA-256: f1e982108d341c225158c6040ce8ace280252c8d49681f44d4fa45db398ae932
font_02_sfnt_off00013a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1