Malicious PDF — malware analysis report

Static analysis result for SHA-256 191d03a5ffb239d4…

MALICIOUS

PDF

81.8 KB Created: 2021-08-20 17:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30f297863e686c188771f709a67cfaf9 SHA-1: 1a9de9a108e5353a60d0048c5279b5fbbd412840 SHA-256: 191d03a5ffb239d479593e6bf224b3a9504e700f31076732301a3d7ebf8371cf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. These links are likely intended to lure users to malicious destinations for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/8b9b2dd0002df054bbfb14d48d31c950/tegegomoxafuxokefovuwi.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/b985h0vfuk2t7dpq8fapm8vvml/lesolafubakunaza.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/efd5d4555e507f21f89f40ab11551d6f/85116171123.pdf
    • https://allcreaturesinc.com/files/files/39919856520.pdf
    • http://smepil.com/ckeditor/userfiles/files/fezugixi.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071747de456a---fixof.pdf
    • http://abwlanham.com/uploads/files/vivegofid.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f0511883---94375419823.pdf
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/39770987376.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607700c4a15fd---vewixazuwasi.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/h8mdjkmpv168i1smeh3tuns76c/91267478016.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081ca40c6e11---55023224063.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c419e36464b5c151c89c003900fcb2e6/jilatumafar.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607752b719ee1---buzodejivoxipal.pdf
    • http://aep-tc.com/cache/fck_files/file/54519218689.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f5117572fb9---50083056067.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/siresomawododonininer.pdf
    • http://globalroomplus.com/bot/ckfinder/uf/files/42352785179.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16099bfe37e180---wajegudisesofoni.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/0c7f56ae346198de3d9c2f2f35b82dc9/20624371285.pdf
    • http://www.tobywells.org/media/fckdir/file/67394694834.pdf
    • http://xn--d1achljw0b.xn--p1ai/content/upload/59370612581.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ora%C3%A7%C3%A3o+subordinada+adverbial+condicional+reduzida+de+infinitivo
    • 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_off0000d621.bin
ad351c33bf5649a52ef6429ec8462d964d7f393c3ac844759dec3363530505a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD621 18704 bytes
font_01_sfnt_off00010392.bin
4e686bca40e9044d67fd3801fd22923e626c16098b7f0f4b4793dab4e6df5176
pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 11324 bytes
font_02_sfnt_off00011db5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 16792 bytes