Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd12253aa674619b…

MALICIOUS

PDF

90.1 KB Created: 2021-07-12 22:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe3f86c8c1e530b638f598665f86d280 SHA-1: 544abe91afe60f8cc8905a6574af375b7db07f27 SHA-256: cd12253aa674619bd7ac99305b4dc83b86a913eb87b4158983b16a6ea1173549
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.niziointerior.pl/upload/file/lokoxevepidubijowikexonu.pdf
    • http://sahamit.net/userfiles/file/daduxemojilimu.pdf
    • https://securityguardsupply.net/php/uploads/file/76258093186.pdf
    • http://ampletrekking.com/userfiles/file/51127860313.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/9jonrdb2kaibk53t718comujgd/vazebezudojuserob.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d8030ee779a7ca4b57e7a5a01f969966/dukupuruwifikidasoxedid.pdf
    • http://surtek.biz/image/files/20150117_091105.pdf
    • http://srtprogetti.eu/userfiles/files/rovujigupamofadajugo.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607b408c0cf96---nixodofarig.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e54737ac45---foruputirozugaf.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d34f8c071f253d9f7bd9f5612af9c8f4/rebokazulibifevigisul.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb14ae3e8---xorusuvo.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fad22af0d0---moluginimosunebumuvononu.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a789f8524cf---65083879382.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716fba59119---51296821446.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e5f62685---88197228245.pdf
    • http://dogable.de/userfiles/file/41647434251.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/942c9s4d5pjh7cdfn58gbir2rk/69497249757.pdf
    • https://kisikana.hr/userfiles/file/sejafinowugan.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca0b31c293---88673352683.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/9a04e71142cf271900b19f490d88d9ca/xejuzetawudawelupupoz.pdf
    • http://icmasistemas.com/userfiles/files/14372958522.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/2bjsrad5st56svoc2rb32286pa/83270865479.pdf
    • http://biotledlight.com/userfiles/file///novagupifiborugilibize.pdf
    • http://satakantaresort.com/user_img/files/gifokirig.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b5a679aa---21308609292.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=walkabout+rite+of+passage
    • 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_off0000fc08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 16792 bytes
font_01_sfnt_off0001141a.bin
5b182359a05037da242edbc4a13a140380dc9515d69205886c3b148282f3479d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1141A 17716 bytes
font_02_sfnt_off000142b6.bin
dc9d0ba913ecfd6df7cdface13d9199de20685a0bf617bf3faab99f028c486a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142B6 10752 bytes

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