Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bf4c65701ced74…

MALICIOUS

PDF

78.5 KB Created: 2021-07-13 23:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b656a7aa7095e27ba9631c169b2a9209 SHA-1: 8d701301db81d8b7b99c41b874d16a61853c29e6 SHA-256: c9bf4c65701ced745cc6a691b7b3adc666494587957efc31b7ff8622db3152d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it with high confidence. The presence of these compromised links suggests an attempt to lure users into phishing scams or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=langley+cars+taxi
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/mhg4gbl8f5j39ldd4n4092i2n4/52822232237.pdf
    • http://j1medical.com/uploaded/file/80984164638.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0084033dfc---dobagekupelunepapise.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f27f88322---45907473294.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/b50d6801e7c49945807397f3e8e04ea6/65426400719.pdf
    • https://contabil-fiscal.ro/mm/file/65376514060.pdf
    • http://angelcabrera.com/FCKfiles/file/87925787901.pdf
    • http://diamondsnspurs.com/clients/12200/File/5209809686.pdf
    • http://zonazero.es/userfiles/file/vibugebopubefided.pdf
    • https://mayurherbal.com/userfiles/file/21254300479.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090072dec64f---wesutejilefigotije.pdf
    • https://autoprofi.ua/userfiles/file/81874420824.pdf
    • http://jr-bang.com/uploadfiles/20210628193841.pdf
    • https://guclupin.com/calisma2/files/uploads/rukaleruwevakiru.pdf
    • http://yachtandgulet.com/userfiles/file/1449720882.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/7516d61fb0973baa2d7d16c57d56dd68/70416435480.pdf
    • https://yepsell.com/userfiles/files/80247726201.pdf
    • https://anfauglir.com/images/file/risatero.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/4i4kif503h2o6bvg05s1ij3b0h/74347608850.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091186c5351b---korukelijomare.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781ec06ba94---17793835570.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d03a87cd722---63297836805.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160845c99f0b1d---rufijivaxi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d005.bin
db03b73a508e671bc8e9b5138deb0adc084c09a151d6d35bcb540df88f150486
pdf-font-stream PDF embedded font (sfnt) at offset 0xD005 10456 bytes
font_01_sfnt_off0000e7ed.bin
25fde6b30721b582cf146eea62fe739762d5fb80885462d769532ece78f03e5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 17184 bytes
font_02_sfnt_off000114e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 16792 bytes