Malicious PDF — malware analysis report

Static analysis result for SHA-256 e924ecbc5653bf0e…

MALICIOUS

PDF

99.5 KB Created: 2021-09-20 04:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 701a6047c644b93bc2a2c9afbaf523a0 SHA-1: d7439731317f750a6456c077691cf95929deefcf SHA-256: e924ecbc5653bf0eaac7226f0ce6672f1d37f3a79756c270310da7ee69971d85
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple URLs, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to download other PDF files from these potentially untrusted sources, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16145b720e9495---jigol.pdf In PDF document text
    • https://wrd13.com/force/file/kifofuxipudetuvatolefegiz.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/49028271258.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/jkjj5qc6tlgitl9paj6afsa2nb/tazonutawiwelufitudub.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161443d68af588---11738632919.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/25609925.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/giwuseniruvajodonaj.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/buramaredijebaraza.pdfIn PDF document text
    • http://renknh.com/ckupload/files/43473934171.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/15135149121.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/pepamalinamol.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614794374be5c---6912934783.pdfIn PDF document text
    • http://chamdure.com/DATA/files/93606723914.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///zodenebedasibag.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/zisisewesusufododazanuxu.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/nejapiwolum.pdfIn PDF document text
    • http://snft.ro/media/file/zuturawaneta.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tabijojirefomibawap.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/82473955686.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/71209450410.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/33344627407.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-17/20210917203548235108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+48+laws+of+power+free+ebookPDF 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_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 10728 bytes
SHA-256: 8039df9745a84e6fa0131e1ec8bb213e78b60fb35c3f701acf37827146f5c107
font_01_sfnt_off0001368f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368F 19332 bytes
SHA-256: 783fc3de46ac616c9c10ae9efa04a4aa60f38d03335791a6659356994753c06a
font_02_sfnt_off000168d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1