Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf89302bf6405620…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 10:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bf51351d90697b747235d1d999e2f2d6 SHA-1: 9ebb5007cc0e5cbe8458a011d2e2ea6cac84e1d4 SHA-256: cf89302bf640562059ea73136f9921bd0915046f43a99d20c79beadeba339c09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the nature of the embedded URLs and the 'link farm' heuristics point towards an attempt to exploit user interaction via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://tommytest.dish1314.com/data/html_editor/files/24090586869.pdf In PDF document text
    • http://ventmetal.ru/userfiles/files/nepon.pdfIn PDF document text
    • https://sanidom.pl/img/file/ronitumesepepadusudukebuf.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/kemisuboluzoloda.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/godepisewube.pdfIn PDF document text
    • http://ombs.ru/uploads/files/geforugineriwodidaluzilu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161416a25ddd46---77487823574.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/tujokef.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7af08736ef262d309dd9d5cd01a5280f/31747353519.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/42700833433.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/87226368774.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/gejivanufufigigux.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a47f8a4305---98484333208.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614832272831b---jijatezulejet.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/gumakibilisozobafodulenil.pdfIn PDF document text
    • http://prmakeup.com/Image/files/nusefalivenagafage.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613252a21d1a3---98113299957.pdfIn PDF document text
    • https://mahae.hu/files/files/45644899207.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/99331478699.pdfIn PDF document text
    • https://seikai.jp/free_images/files/76329473660.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/97498662621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pixel+experience+mi+9+sePDF 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_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 10428 bytes
SHA-256: ccb474a4baf544ff910e5231995eac293497513a8b7d5ac369a008a4427343bf
font_02_sfnt_off00010a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 18108 bytes
SHA-256: 696076bb35f9b4111c9a4c7c041013e4219ae3d6266020632e187b99bdd4209a