Malicious PDF — malware analysis report

Static analysis result for SHA-256 12695e30f413f258…

MALICIOUS

PDF

75.0 KB Created: 2021-07-07 03:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9037e8486c88e8de072eee8960e8f4d6 SHA-1: fbe119ca5deefc3e49ff2ca08cca40665dac449a SHA-256: 12695e30f413f25886caa4d6055624e9440415e3bfce60d5648a1a5d04aa2445
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV identified the file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The primary attack pattern involves directing users to potentially harmful websites via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://medvor.ru/uplcv?utm_term=red+factor+african+grey+for+sale
    • https://roweryelectra.eu/app/webroot/uploads/file/16202082977512.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/2e0ec76034cfcfc09ed0ad97ed5990fa/zasazobe.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6c9767a31bf76d0909e41e19482d6c5a/xirimuvo.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qb49l7nmtg1gro98lpq1uvphu3/81503866118.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/jpu2dj7mqnfkvrruf2shh8lnr3/purerodeboxinegage.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/0b10129560fb181d84a2030f855d0c54/raxibudexukinozizex.pdf
    • https://reitinguok.lt/userfiles/file/60798777416.pdf
    • http://alemotta.com/resources/original/file/rubevib.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079db06772e7---21748737985.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ed2b38bbe64199b1d8acbe04088f416d/zekejuzugesanunesarino.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/fukura.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089876df07bb---19993927656.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2c14117ba---pozesux.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0a4790128be6ad4535272a11dc17ad76/kijomoxojego.pdf
    • https://bczenekar.hu/files/file/xogajexupilalurax.pdf
    • http://fullhousetourism.com/UploadFiles/file/20210627161636110.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/tuxixubabowawimi.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/786fc769c504e885f0a128ec4aa36a73/55870636858.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cea7beeb7---mexotozop.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b049d18177---dutaxokezopiribitidisujop.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c048314bd28---50491405116.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/b88c27ec226b95534f12ea33f4b26a48/xegivigomekupevazopida.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/b90836bb4ad065d63d7c50e8e8611a64/mewomipugasonel.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e35d0a44cad---95054388046.pdf
    • http://uk-finansist.ru/userfiles/file/radetu.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/81234172423.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/o3uufqpj2fpsl48aplue0tid96/sitojegok.pdf
    • 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_off0000c365.bin
6dc9436b7aa16b3d19cf7c99c8f2090d85afed53a38749a25b7432b2d2efb83e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC365 10808 bytes
font_01_sfnt_off0000dc3d.bin
7d0e747b52240d2a2e216fe6a26f8383c9942e4e316bc249aef703f5556f2ee6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 15712 bytes
font_02_sfnt_off00010492.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 16792 bytes

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