Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fcf1ded7d2955c…

MALICIOUS

PDF

78.8 KB Created: 2021-06-26 18:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 585eeac22a3d3459749ca1e53bdaf7b4 SHA-1: 0de26be7cb1044265c41e0c67cd15ce2d3df0c04 SHA-256: c4fcf1ded7d2955cfdb1417b398bae1646a85156fba4f37264c6806e661a53b9
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 websites or are part of link farms designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://hydrem.ru/images/file/joxuxepanusozijusobodoxi.pdf
    • https://ludifrance.fr/userfiles/file/kemoxoku.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/a6ff5e536939dd213c92976eaa63d251/rapijobafowurexidazuladaw.pdf
    • http://extracam.es/app/webroot/arxius/file/46818202211.pdf
    • http://sarlampa.ru/upload_picture/9052327185.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f45d87ad---52218083179.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/920e3bb2b7fee948963c0f30f772f067/vukatevuvogupekar.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/gurafo.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60d10bfcb2---45057741335.pdf
    • http://ownlines.com/upfiles/file/lumikoxumopapa.pdf
    • https://rybczewice.pl/userfiles/file/58530757663.pdf
    • http://krakow4you.pl/krakow/files/gakilonuwulusu.pdf
    • http://ttccid.com/userfiles/files/sewala.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a51701897---71521876602.pdf
    • https://securityguardsupply.org/php/uploads/file/votoresafikajewuvo.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/95854845867.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/rpc6ut9sqkcqjrdtatjjs671eo/23517142424.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/2e3fcd1fbe415e3e51d4f3f1ff10338c/sibagoxovamu.pdf
    • https://arvikabc.com/images/uploadedimages/file/simekifeka.pdf
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/772410979.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/4481f94a3c00fa2cf982b88d20f6c505/62861382150.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9c406f78c.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac32dacb29d---wemitalefifereripuruv.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884e98d6490---34851690528.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709e3329ab2---dosipiruvujoviwexe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=acute+infarct+meaning+in+telugu
    • 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_off0000cf26.bin
febd73fff2c20c3b737b6c2355d75f2cc06448e26f11dfebb4cecc833892eb36
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF26 17336 bytes
font_01_sfnt_off0000fc1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 16792 bytes
font_02_sfnt_off00011435.bin
d574429294b979f01054da9ce3e10f6cbd6886be257cc39f6cbdb96ab9f083b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 10472 bytes