Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a9bac5413ecbbf…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 09:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cbebf0248001df323f185e4e780e277 SHA-1: 93241473f313cd3af69f164b3bdc6442b1df0916 SHA-256: f1a9bac5413ecbbfaad3b06d6ec27074aeab98785033617dc76d530d7e56e8b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users. Several heuristics indicate the PDF is part of a link farm, pointing to compromised WordPress sites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/2ca76893efe0713bbdb31acadfde8fb9/nevojarodizuwuroronobipop.pdf
    • https://luathoanghuy.com/uploads/files/47354117206.pdf
    • http://dj-venci.com/uploads/pages/files/86411674232.pdf
    • http://zaintik.org/files/galeria/files/4370330844.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/lelezibuw.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/3o0vl7to8qqk9eqjfjmcg16sc5/73428739622.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/e2oo8erajfboucn7sqphipues4/mekolilureme.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/os23hvk5it5bnj7t3a0s921jni/4126440772.pdf
    • http://onthebroadway.com/CPD/adminpanel/upload/file/keguva.pdf
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/sagovo.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/f82105bc0527f7856ec9894c8dd3a676/filarawixafigetopapev.pdf
    • http://sro52.ru/uploads/files/6421926773.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091d938b7c65---78705629081.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/zurujisutomevezipikus.pdf
    • http://fedime.org/imagenes/70096733671.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/fe80df053ba28a73c1775e79c1df0512/taromakiluzadeb.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20134464846.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29e894954105342e17d4e1d65dae6667/55915681654.pdf
    • http://mppscstudy.com/admin/usercontent/file/16087731520.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075a5a00a22b---mazapopuxudokikam.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/fa279c09afd6f77134cbe4ee4b11e895/dopuxafesaxova.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c26397faff8265791b6a0e799cf60c1d/wapuf.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e64a1da8526---siluxaxawuwipeg.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160baeb6d6938b---10361724411.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+to+eat+to+break+your+fast
    • 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_off0000dc9e.bin
b21e29764ba9f554fe1d1206813d29a29a977d8ea6d48d12f833cba0590dd28a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 10508 bytes
font_01_sfnt_off0000f4c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 16792 bytes
font_02_sfnt_off00010cdb.bin
81833dbea0c7418af9453d9a8ef92abd10317450595b0d9c2a75b597232863ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 17040 bytes