Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0aca1b462eb7695…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 01:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ddad5e520822c3f466a8de390b06d16 SHA-1: 5f0ecd2e8cfc87d2bd019e881950d54a3b6576ff SHA-256: c0aca1b462eb76955f36bb8e33edaa50b1aef50f9c580db04ee9949eab4b7dc9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to lure users into clicking malicious links. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbbba02bd0---larugedet.pdf
    • https://cesiedizioni.com/userfiles/file/zepipugemisufasizejepafir.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/45eu020dqs192teqv0pfehn5h3/16129266367.pdf
    • http://designbeginnings.com/upload/file/2962151187.pdf
    • http://darienhigh69.com/clients/866565/File/64164291579.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/padomisu.pdf
    • http://asbazainville.org/userfiles/file/5679224874.pdf
    • http://allier-genealogie.org/File:/labokixopolixesoruronaduz.pdf
    • http://unseretochter.ch/images/file/27784148557.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2u3m25v6llgv1psqaeo88sb4tr/44040050024.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7d98250b---2479556119.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7d50ce602cf8a379496535a1ea4cf621/kazuwivavalinezidu.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607824c7ea934---26611491436.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/nefudexej.pdf
    • http://gillsandgeckos.com/userfiles/file/joguwezugobonoluze.pdf
    • http://studiogaleazzo.eu/userfiles/files/zimenomomafija.pdf
    • http://millecolori.it/images/file/18887289760.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/e99948c957146b908d38f01869ac6b64/93476264344.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/86dancgni4peo1t9ov3kdobfa4/42548746669.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4664bbc5e4---56982771923.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d356df2220---400241588.pdf
    • https://mmszke.hu/files/file/gogazutan.pdf
    • http://redondoclassicburger.com/uploads/files/sutelidiwimo.pdf
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/74137812745.pdf
    • https://noithatkuongthinh.com/uploads/files/86295166378.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=adding+vectors+parallelogram+method+worksheet
    • 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_off0000e8c4.bin
40838eb118f4c202cd321365310a6eab0c425e3aaf080b77fc974083aaff26be
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 18628 bytes
font_01_sfnt_off00011952.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11952 16792 bytes
font_02_sfnt_off00013169.bin
1cd9b03698435dc50cea028a0a8e1bbd311f35fe49fa2e47b9dc68c01df73e26
pdf-font-stream PDF embedded font (sfnt) at offset 0x13169 11184 bytes