Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c81dd1af8b3feb…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 19:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27fb5c3cf98fd9a886ad6364a57ee567 SHA-1: d1346d013c7d5880d5e04aa08ea57df9392caec4 SHA-256: c8c81dd1af8b3feb00cdf1e8bf7803c43369534034ed665663d297d570821bb3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://mtmnetwork.net/uploadEditor/files/11238577639.pdf
    • http://crmloccitanecr.com/campannas/file/xurotafuvikafotojojupa.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ode84pbmod3aodpjcufdbbvfs4/lugixikavopiwajomasa.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/b0548c70e72629600cda184f516bd00e/jozebazufojovob.pdf
    • http://ozcetinler.com/userfiles/file/kojovojuden.pdf
    • http://ankaser.com/userfiles/file/915231276.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/80723514076.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609217cbe3279---dudemamipexu.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/n32j5bamebcldcskgp6rn7ovio/20811330859.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256020b136---tawimovulatukogefafitex.pdf
    • http://vandientuchinhhang.com/upload/files/dadotedemubipinaripa.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d103b87991---330398198.pdf
    • http://www.dilipprabhavalkar.com/images/file/vutemafepivajawi.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160731e9c79f18---34502091621.pdf
    • https://menlopark.com/wysiwygfiles/file/7807862262.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098951bd20be---dodule.pdf
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/34153656203.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613090cd8002b---31207043929.pdf
    • http://csim.jp/ckeditor/uploads/files/lekovozomise.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/14619519152.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8376348cf---35543736258.pdf
    • http://laskod.hu/userfiles/file/92439979773.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/0qd2cgh0fmtmsbk70mak4g8c26/sezopazaduwenu.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608140d4360a1---vamibu.pdf
    • https://u-spot.biz/js/ckfinder/userfiles/files/laxupumalorinizaxifobilo.pdf
    • http://extintoresorigen.com/images/editor/mufapafasekolazivov.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=script+writing+pdf+books
    • 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_off0000e80e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 16792 bytes
font_01_sfnt_off00010025.bin
931d980721ea4247eb921b9b6aa3e4ad7dfeea9d2d985845a0ba51f29608677b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 10848 bytes
font_02_sfnt_off000118dd.bin
c5f1fe4091f9dc08f40cc7f4da3a30282a5da9ab732f4f086717f489b3c63617
pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 17376 bytes