Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4dd17787b4c49c…

MALICIOUS

PDF

99.9 KB Created: 2021-08-12 10:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f902c5b99fd1f3409865b312bd3ae519 SHA-1: 9f52832424113e546430cf684b9b3682dafabd60 SHA-256: bd4dd17787b4c49c52196600315662b739c14450d1009ce87f7b4b14727e5c24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607569b28be07---64759054485.pdf
    • http://agroanaliz.by/upload/editor/files/22342858171.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/96d0473f97aefa71ea726217eb96e8f7/64604620997.pdf
    • http://gocreate.termall.pl/upload/fck/file/tozonuf.pdf
    • http://energosol.pl/images_cms/file/kebaviverejopitebuv.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a28de9ee174---jalukofivizipilerojaku.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7759de9ac---pisufelelugi.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c82fb927f3---24024124236.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/6e1350a09b7f8c471d944428f2d1575c/joxafagagilareluzulog.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c914a5d847---80928023045.pdf
    • https://sindonis.com/userfiles/file/fabufotazekidimuxab.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16103e0c64ecac---nugimadalozajojimituda.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/8ffjvo1qpjqjg0o2riu9kgtht1/dekisowefutokoboraj.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6100eea0688b2fe9f8dce1ffa3e9495b/95930745276.pdf
    • http://kleinschaden.expert/userfiles/file/97023137322.pdf
    • http://acril.ru/ufiles/files/77855964123.pdf
    • https://coluer.ir/documents/file/46067399866.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916c8485c17---2168978084.pdf
    • http://gtshotel.it/images/file/tozedokoviv.pdf
    • http://www.gdchgs.com/admin/img/files/52996514781.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/afcf8c1dd2d4a2773618a24e21af095d/53079661729.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/m1rsooabqmc3vf12qae5pgehih/22117332063.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=canon+mg2922+manual+espa%C3%B1ol
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010661.bin
e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500
pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 1636 bytes
font_01_sfnt_off00010e33.bin
f9698169cf0cd9f3cb4303ffd73105b255ed900f9e8bae24e04895ee38155f47
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E33 10932 bytes
font_02_sfnt_off00012762.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12762 16792 bytes
font_03_sfnt_off00013f74.bin
1c791cbeb42528bf0733e30ee766e62065e27d94a5ae93516a76c289606dd72f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F74 26568 bytes