Malicious PDF — malware analysis report

Static analysis result for SHA-256 93fec6b524cf2728…

MALICIOUS

PDF

81.8 KB Created: 2021-08-15 11:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fe6b8311fccab5840242c3f57da8637 SHA-1: 46b35d815c5ccd11205f5529a61aa911d1a0fbbe SHA-256: 93fec6b524cf2728bc327368a459aab24bb951bb6da4e31e286d811a4b7709b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs and link farm structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8924

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://chcial.ru/uplcv?utm_term=togaf+9+foundation+study+guide+4th+edition+%28pdf%29 PDF link annotation
    • https://amatnieks.lv/pictures/image/ledukepokapuzamunaxa.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c1440891dbf---12132629297.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/5pe4a5uqg5e7vbde9fgun08cvm/19891147327.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/91042197692.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3385f95d---70690715125.pdfIn PDF document text
    • http://voorwindenotariaat.nl/app/webroot/files/ckeditor_files/files/90286524002.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/vepibikulepofavow.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/25264056481.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/31506990489.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609833b760ee3---mewuxegurexowukevo.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/rasejun.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/kr1faij8o4484b3qhs9b85kcrm/1830550005.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b730c27c90d---65184437663.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/bitegamowena.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d564ca3d5d---23272425689.pdfIn PDF document text
    • http://chsjackets75.com/clients/a/ae/ae1e0d6431e3080ad3d3eb1024a27f31/File/87254175043.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/kadakosikusugu.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0573983001628609222.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/10537936260.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/miledidivutububemeje.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/wovinujowofa.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d7dc2c4a964---94752275177.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/a669f689b67f25720977929ce2b69a97/69018445578.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610fa75868784---42188290375.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/vivolewanowez.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/49782732567.pdfIn 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_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 17524 bytes
SHA-256: b5860c19ae8e5f21344d4b38748e29b7869e214e0370520df32287ebd1b005d6
font_02_sfnt_off00012590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12590 11208 bytes
SHA-256: 8b7f6f2921fb80cbfc15b72673c0afb34b554ea42968148159781a2398c410ee

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