Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d8f3ca10369b5f…

MALICIOUS

PDF

79.2 KB Created: 2021-07-05 17:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1d69e13f288ffa7744cdea9082555926 SHA-1: 8bccf9efb032f95cb1a41d384210540a836d4497 SHA-256: 26d8f3ca10369b5fc9b8430e19ddcaf04fed0ca194c6a2d4771ea61ae786b289
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to WordPress sites utilizing form upload plugins, suggesting a link farm designed to distribute malicious files. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or malware distribution vector. The document body is unreadable, but the heuristics and URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9401598d6cb086ff629d6d10f6f5524b/vuwaxen.pdf In PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf790c947---11783238893.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ilf390j2b97enmb3lr8qfr9r16/95868821840.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/mopuvujalulopawelotetu.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa2d76fb98---rezukuri.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/81390011463.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/17324027935.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lbdmmdn3dq5lbm2stiq618v041/kufuziramurejuxip.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/15642767608.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/maroxutajaxu.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/nomarumokilonuxavatuf.pdfIn PDF document text
    • http://wenxuezj.com/images/File/zewoxelozivepixejataxev.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/86128541024.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/39410215582.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b72f728db---lozeke.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06d316d70---bonoxamokatura.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73f1492f8---zibixamadibo.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160759dee34168---gegutob.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/34365999609.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b4ece8aeb---16469581662.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4ad56131df91c758c54425562fb79068/zositilovif.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/60567660946.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/56367454380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=parotid+swelling+in+alcoholicsPDF 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_off0000d080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 18032 bytes
SHA-256: 4643cdd496ce69a6521a6fe438d8f000431f0711eac55db91778ca320a1069d5
font_02_sfnt_off0001173e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173E 10736 bytes
SHA-256: 1fe9f28f69a02ac4f9c4e0491b0b792548e2aa6669ab4ff421e0e08b16607b19

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