Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b756bb94dbd5760…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 19:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58ef3ef6986a8c874e2e68fdaa6f44c0 SHA-1: c4807fcc5557c2236d5dee58533ce49e80d58415 SHA-256: 6b756bb94dbd5760ef969b9c8fe64eaa1bc3272d20ee1e9cf6195de880b1ddea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=download+game+resident+evil+ppsspp+android PDF link annotation
    • https://cvsc.co/userfiles/file/zorokokufenutewadoto.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/suzigukuxupupumefagulak.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/80724965869.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/volonufobowuwi.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/43318791909.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/fatizizaraxijeluxeb.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/wigepuwided.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/59dfaec1f8e5599dcee3c25c7dd27108/98906799840.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a152c2f0dc---63155253045.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/faguponegepol.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ac21904e---nisulor.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/7863500547.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/25688901758.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/mowuxoz.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/80875143865.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/46463678609.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/bedudejujisoxeterorabo.pdfIn PDF document text
    • https://jck.ro/userfiles/file/81194323622.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/padudanirex.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/8877277378.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/1115571406.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/58447246566.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/dagaleresa.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_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 17416 bytes
SHA-256: 600e93989a058db2a3b93df119d4fdede49c0c5d8bb10c352b1f99931c9a35e2
font_01_sfnt_off00010f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 10888 bytes
SHA-256: 628870fd8379702f746d0068d4d786e1a7ea0cc0882b1214b4c5f4c77361566b