Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de80e47ad93c13a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 19:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bf84dbc9961fc97270b51401f29e2a1 SHA-1: 81511507096755e1683e60400214e418e654949c SHA-256: 6de80e47ad93c13aeddb257923ec02cea42d4913a86bb9053a975f63e29c7f2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://deniz-sogutma.org/img/userfiles/file/bozobamez.pdf
    • http://enotecagaribaldi.it/userfiles/files/vorewodopuposapaseki.pdf
    • http://doanekeyes.com/userfiles/docs/nejowodojuvenu.pdf
    • http://www.enredmail.com/templates/files/idCliente_/file/givibekotex.pdf
    • http://ingmarcofaedi.com/userfiles/files/24067244108.pdf
    • http://scantech3d.com/files/93013540828.pdf
    • http://www.leasebridge.com/CKUPimg/files/87048301233.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/14822432193.pdf
    • https://cleaner.pl/userfiles/file/zivisumerevuvejimodove.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a91f482a18e75cd57a1e058da8c4770c/gubazaxikoxuxuxi.pdf
    • http://mlsy.cz/images/file/files/degesipazojogaguv.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/39268651487.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/nde1vh24iee5d4ts9kvtleqjpc/netikagomodowoxilajubafo.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3b0c60883---majudaduzejin.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/29a1822f29609d55967a86309ce996aa/68496431583.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c55f8bb1f---2770559601.pdf
    • http://saigondome.com/uploads/userfiles/file/vigunegala.pdf
    • https://diaochue.vn/userfiles/file/duretasukigosakevikek.pdf
    • http://drironcat.com/images/file/vosunamidifafaj.pdf
    • http://malbreil.com/userfiles/file/nuwuzager.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/241de91601e55df409d5fecb1600d522/17196934188.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160f354fc73bbd---1042219120.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/6e3d2eec1bd7b7eb2da6caba57525c65/pizudelipiwusagif.pdf
    • https://chatsystem.site/js/ckfinder/userfiles/files/59251500161.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=forever+young+choir
    • 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_off0000d374.bin
76094da36c0e6639df7bd3f2da6949881228a85f600aee74163dbb3d811b5317
pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 18424 bytes
font_01_sfnt_off00010340.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 16792 bytes
font_02_sfnt_off00011b57.bin
73a2ccc888d00ef89d5fdb9b3360a81c7209f1320b63885028354d278708c829
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B57 10292 bytes