Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd57f151d60047a…

MALICIOUS

PDF

69.2 KB Created: 2021-10-04 23:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 360d2428f3c0a0bf705fbf700d889546 SHA-1: 56ebbdab8eef3854866d4eec4a87a38b78957b1a SHA-256: 5bd57f151d60047a70ff139ad29a9e1fbc775ad6f0c051f2637a8ac39084fc1e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=phet+gas+law+simulation+answers PDF link annotation
    • http://fbrasil.com/userfiles/file///71405248634.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/wogedejupodegesutaseloro.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/zagewitubase.pdfIn PDF document text
    • http://mrybalko.ru/files/18347585724.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/88423595363.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/tezukabumenunujazumexoj.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/tuwejarujibozofevesit.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/62714685155.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/e2dc8a79128310f72d9988fb87c7db73/68967153921.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/50415064935.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021100113011041.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470a499abc7---lugifa.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/xavat.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/3a91f7d3cc00db1a0a9f3d71e92782f9/66314147662.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/92621958818.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/16511940173.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/fajepapozerisu.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/mowadaboxewaweremuwidinir.pdfIn PDF document text
    • https://htchninc.com/d/files/20106734792.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/11055521233.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/98410140921.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/61869442626.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/25581471770.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/573218486.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 10740 bytes
SHA-256: 754d259405d6c868c23e77d9e0d70cd31453ecb1fe39112ef0d34851745ddca0

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