Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a73a3d1cd30588…

MALICIOUS

PDF

74.0 KB Created: 2021-09-05 00:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 880ec14ee3dffd6e0969ddc6fb00d504 SHA-1: e95ef7e7643f50444668597ac8bf4689daaa7069 SHA-256: 82a73a3d1cd30588fbc3bfcfac8878103783afb690c71cfc8096778fb8a37825
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO manipulation tactic to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://pixomot.ru/uplcv?utm_term=1998+chevy+blazer+4x4+manual
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f8ef99353---zugigibedegeworetox.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ms0auqje2sanngptpvgq4ps917/77402507324.pdf
    • http://vipdiler.ru/files/file/5486200092.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3999330bf7eff67bd02d490465aaafb7/fobobosuwunodajezusawesoz.pdf
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/9966039333.pdf
    • http://epicridesnepal.com/files/2240387804.pdf
    • http://formpart.com/upload/ckfinder/files/84760121590.pdf
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f108d282ad---53458048636.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/64214081436f453f95c04ebc1cc2411e/xarokabedisabajezaba.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/30cd7e52e14869d4d9e618b86fd7db21/rurut.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/hstufa8d6q09sou5hiirasnhss/61472778898.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a70c4e80f61---16201634095.pdf
    • http://nerezove-kuchyne.cz/UserFiles/File/95367356926.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/2798357df661bc4eab8985d7b461c11f/28221607109.pdf
    • http://narnivet.com/userfiles/files/zugiwemepesonibolew.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c5ab0db2---32295087949.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877fa168398---86058850761.pdf
    • http://zwickerfoto.hu/_user/file/13982056491.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2bf99153d7---masunaxigesob.pdf
    • http://www.themixchange.com/userfiles/files/midopiberi.pdf
    • http://brilspa.ro/userfiles/file///19507229513.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19d0e71fc---91664274390.pdf
    • https://www.jakketoes.be/ckfinder/userfiles/files/19337832724.pdf
    • http://mazdooradda.com/userfiles/file/maxiteralijikuvinomibo.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0cf359abe3777edee51e673c30d4681e/94579360529.pdf
    • http://chronicles.ae/userfiles/files/52132717315.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/65da1167c1493f55b1c2f74c9ef4ac51/tapota.pdf
    • http://jgbt.us/pds/userfiles/files/27253899678.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_off0000bc71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC71 16792 bytes
font_01_sfnt_off0000d488.bin
6ce58c880aa2306ef66f0f5e3a8140e79dc509fc70a753615654d7a2aeeaa16d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD488 11008 bytes
font_02_sfnt_off0000ee22.bin
1a389afd273496bf3984ab2f9d5ebdec478b36448ab221d2758c2fd580a8ce35
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 17108 bytes