Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdf9302f372b51d…

MALICIOUS

PDF

80.2 KB Created: 2021-08-21 02:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b8179df0cf641a44af43887733f1a8bb SHA-1: ef018063fcdb14a57a2bb91bcc4c05f8ab063291 SHA-256: 8cdf9302f372b51d5518d16bdccb9143e6857e66e72a9b83954728b60eda3b46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. The primary function appears to be redirecting users to other malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://austria-ex.com/images/blog//file/mevojubojevaforevorisod.pdf In PDF document text
    • http://www.radanhorse.com/resource/files/56623672017.pdfIn PDF document text
    • https://dm288.rs/slicice/file/87593735585.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/67856438895.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/93900174192.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/6596380461.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/6531527614.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f702ea2f3981438cf8e7a0ce3807928d/51118689171.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/fubisavuxes.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b433fcc18dc---dawutosulomifemefevi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7c20baebb9d51cb2a049ec30aae434e8/labeji.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ea0acc4b48585aa8d719725acd2b6630/gufejezonolasuvi.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/92968319033.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/zujem.pdfIn PDF document text
    • https://mytopics.it/uploads/file/67983877923.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/bulukazaku.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/dodarab.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/22104383584.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fc22d521de95672c87ae8637d44ed9f1/29919421579.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/82382138041.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/jonija.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd5b6354d0---tojesu.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/sagizo.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/jazoteratusoraxokajux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=certificato+di+conformita+infermierePDF 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_off0000d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 17588 bytes
SHA-256: e041f9d210a5817e6b05723f53c8fa9ced97d4f87b129a942b6e3caeef869f9c
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B87 10456 bytes
SHA-256: dfb97109653c3c331acb97e5e4344d9a93fe43ee0a578e3ed364aa9a11bb8387