Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0fd2638c6c3827…

MALICIOUS

PDF

88.6 KB Created: 2021-08-06 02:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1cb5f3b6274a02f8bc5193dc33f67f8e SHA-1: 3f050a3d17447befedb463a1606a2d7d8929897d SHA-256: 8c0fd2638c6c382793525a809f62fbfa9f9c894a4584e5ebd48d54d5a975a80d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the structure and numerous URLs point towards a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ketchas.ru/uplcv?utm_term=how+to+put+saved+instagram+story+filters+on+photos PDF link annotation
    • http://clingac.com/d/files/relotatotesupuzukoduvaxok.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/f5b4dd384868bb468b8d5b6d2654bb76/xajepe.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2ce1b400cde493cad7873691572ee0d1/71482075230.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tlmg2ltk7hp86rgopcl8ugd4h4/kadepab.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/6mn1fkdnnbv81jl9tro81opoam/xakovagon.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/puvon.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/10398914576.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3de3f645d729e8b6dfb6d078aa5348bb/71625092825.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e05cc5032---20448440167.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d79a1c7d13---8343380538.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0ca5ff0b461c64a6fae29d972e7f127b/49261436240.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb424027a3---89749144434.pdfIn PDF document text
    • http://www.emailposte.com/pictures/91208593871.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095b1194d17c---98795293067.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/70612650114.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/906036469744044f6f45307ee055e5dd/51367559606.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/47086843952.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/d070e3ef66d8249bf8d03971b7ce8554/86304148259.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/lizutezesusazipejogo.pdfIn PDF document text
    • http://mertlakustika.cz/images/pages/file/78371681813.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/79739412232.pdfIn PDF document text
    • http://gekon.net/userfiles/file/76594169200.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1aa9d4653e---sopejulovuxilikuzumeg.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_off0000f70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 16428 bytes
SHA-256: 0c95b77928065c63305f2b27d2d782be58bab20c61e664510867051c53049aa5
font_01_sfnt_off00012150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 11304 bytes
SHA-256: e940a6fdf15ac6d5fb0714bc4d2ce41b412f86655f9ef784e8e1814344563a85
font_02_sfnt_off00013b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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