Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33b4387c2b1249d…

MALICIOUS

PDF

89.5 KB Created: 2021-07-07 18:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88106e3a3ca3ecfc92ed582b879fd4ff SHA-1: 1ed37910f8ec637d6f9f5ca7a93553a622870875 SHA-256: a33b4387c2b1249d16e6058540b0de0032853b04285640697787308aa55b9a56
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. The presence of these links suggests an attempt to lure users to malicious sites for phishing or malware delivery, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://reunionclass.com/clients/7469/File/kutesagizumawu.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/l0qr99p2i47t226fsa831dsevm/retikokusikazerorafere.pdf
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/92367591445.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876ed1ef381---13175367244.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b4e315d7f5539326ed2212f9eeac60e7/dabekomoweduf.pdf
    • https://internationalmedia.com/userfiles/file/10678549724.pdf
    • http://inse.us/uploads/images//files/guzemil.pdf
    • http://eurekaloggers1970.com/clients/a/a4/a4917853023b9a70bc4506ca58f09c65/File/42305512063.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16087c2895d18a---61938622053.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b22d1c9f5---33354058707.pdf
    • http://teplospectr.ru/images/files/fafesinizurej.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/86b0f590905d144b9abaa78e7c1841da/52723226201.pdf
    • https://tonwen.org/userfiles/file/zipidole.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7076def1c4---mobaranumas.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5dd2dde90a8f3baecff8fe939a7cfb0a/50149751927.pdf
    • https://signika.pl/Upload/file/subugatuzakarukovurak.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/136715af01eaf0b3ad00322439ac3531/jelivurad.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/145c194366abe29bab5cf9fa294eabd5/83458197532.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084a1d5b8edc---gexulemupurapisutexuwosod.pdf
    • http://syuncyoku.jp/upload/file/xovaxos.pdf
    • http://agcslohian.com/userfiles/file/39573550876.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ad91c8160ad---85671102778.pdf
    • http://akcjonariusz.com/UserFiles/file/64567833860.pdf
    • http://smflow.in/admin/uploads/file/ridetaluwunepexinosa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=questions+to+answer+before+getting+married
    • 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_off0000f87d.bin
ff495136c1a195936f71b712f0e34a5f5eb3585fee89ad0d8ae1fb7e27ff6664
pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 11036 bytes
font_01_sfnt_off00011229.bin
4164343ddeb699d4ddcbec6f6d17e0477627c5cdc2bf2d0906b449d3061c4f62
pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 17176 bytes
font_02_sfnt_off00013e89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E89 16792 bytes