Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f01756e2983c5e5…

MALICIOUS

PDF

92.7 KB Created: 2021-07-15 15:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdcd1b99777b78deed1d61f81947cfc4 SHA-1: 6a6dc28cc9a68bfd1a7f9ae2a3455cdfe30d3d45 SHA-256: 9f01756e2983c5e5d5542e35acd4ba32bfa21dc3ece10eced5c8e26f8319af6f
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such documents for SEO manipulation or to host malicious links. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lmnp6fb2d3bs85pms9bl7rb1o1/zusudemabexigodigisineja.pdf
    • http://keacg.com/upload/files/vularul.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/2f2e7fcd5ac9f3ba991e6a211c4daee9/xabitisasejodipe.pdf
    • http://sahrugs.com/userfiles/file/timufir.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/reginabipamivademotatope.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/4fbb67dbe544e6ca43f033da24b5ba8b/37383591866.pdf
    • http://changecn.net/ckupload/files/liziwinebesipazodapes.pdf
    • https://gencshoworganizasyon.com/upload/ckfinder/files/64946203488.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160812a84a997e---19501346131.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160e49cc98d2b4---fotejadalek.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/9215a44dcdf29806ca4a226b0e4fd2a1/lawusape.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/pukapusakesadifujotazil.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/o07q5e01obutrp7i7d6vlurb37/mufudenisiwexidulodaladaj.pdf
    • https://lawina-radom.pl/files/file/tijid.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/xogiropig.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac134ae0fbb---jowekatumise.pdf
    • http://bigsvatcharasith.com/userfiles/file/23883580376.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//20015551579.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf27efa34b2---kobujane.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e12bbc84---tokivikakoxutafik.pdf
    • https://caribemed.com/userfiles/file/46299014921.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5171d270bdcc767cb4b3be094249ff4b/lakusadutupu.pdf
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/91328094251.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b33b2b0b9---11608664346.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085568c48829---valawixexuruz.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6ibt4rba8tsge7bhimktpdcj6/13961093006.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3f39126e---59708910507.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=surds+problems+and+solutions
    • 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_off00010434.bin
9c8c47c1b2a471a269be1c1ed240252456685821fcad956a5425319dafbda241		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 18232 bytes
font_01_sfnt_off0001349d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1349D 16792 bytes
font_02_sfnt_off00014cb4.bin
5e481874234d5fe3157ea3b7f264bb43eedee66ca7996b684c118b8c851ba4e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB4 10868 bytes

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