Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c307c0822c6a01a…

MALICIOUS

PDF

79.8 KB Created: 2021-06-28 04:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d6b859dfb77e2b5b765b14655d78749 SHA-1: 0c37635e64b89a0b679d339af135a1d9acdd4df3 SHA-256: 2c307c0822c6a01a66270107a66c7c8c8cd9c447d15da4171486d9a8ddbb7564
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://daimarconstrucciones.com/images/admin/file/23096689948.pdf
    • http://canigrup.com/userfiles/file/99053932304.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3a10a7715d62e67c92225e11c23a83dc/33703273069.pdf
    • https://denizlihorozu.com/resimler/files/nonitalogikow.pdf
    • http://arunimaflavours.com/userfiles/file/mutoxesazuvifurozurog.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/335008510e88cecc659715aa79a16c8e/didokigezuwudu.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf379b2c2f---weginovijirugekexeratikor.pdf
    • https://kham.vn/userfiles/file/samoxexipaliwevodoki.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078e016c16a3---sorabotuvizowisemo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894cdbc453b---kobodosoguxax.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f28572915db06817f16292892c9f632/tatajurujuzevafuzaxufose.pdf
    • http://simonhoirup.dk/userfiles/file/13284071778.pdf
    • http://ahcxdq.com/uploads/file/290815144649.pdf
    • https://anmimar.com/royal/userfiles/file/sawujefonuxoxupeladodujex.pdf
    • https://hkbca.org/UploadFiles/file/20210624052532124.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ccc0a8gg9g6ngdnk683ao5mes1/19719377061.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/03676ebb3d4c1180311ce91e74f81f52/34787344463.pdf
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/dawaruxanonejofebugumifo.pdf
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/dbfe1b9403c86f5a75af0f1a5039095c/pigemob.pdf
    • http://vtvxm.vn/userfiles/file/57676027813.pdf
    • http://icmasistemas.com/userfiles/files/gamokip.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d010e0506a---gerupalubebonikixi.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/1gpp0n6vo7ouqmh5sj7r92t12n/munogimugosiwatavoze.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/u0hmflmlo9omblukhgv17eknnk/zigibokijibujoxag.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=money+is+no+object
    • 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_off0000d705.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 16792 bytes
font_01_sfnt_off0000ef1c.bin
5a9f62e6fb122e30572fb1332588ea729767057f959350d26e86098463ba0083
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 10292 bytes
font_02_sfnt_off00010675.bin
b80b24bdf551699a5495c7f49c81cee133a9a8d0a13f11fc47d457dc061be659
pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 16380 bytes