Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b92f3f30e82a13…

MALICIOUS

PDF

100.4 KB Created: 2021-07-03 05:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6642fb9d10615f80769d8c10146c675f SHA-1: 59a33099623cccf9c8fb3a552bd37c66aac062e4 SHA-256: 92b92f3f30e82a1353c318c517277b796f36481c54d9a7f43cd01a18face34b2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to external sites, which is a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/pezetegesodemotudavopuzep.pdf
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/jananipofi.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d62edb27354---877621742.pdf
    • http://chiengthai.com/file_media/file_image/file/zesugi.pdf
    • http://sun-eko.eu/files/file/jobozewidibulixewumumot.pdf
    • http://edgecs.net/documents/niwefimusitukolo.pdf
    • http://nktrading.qa/file/files/kexememadokekuninaduno.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/do1i8u91d7vdkubp8pkdp43mru/43360673846.pdf
    • http://pampa.be/uploads/userfiles/files/gapawewexixozirum.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/cd213972ecba95476bffd197b2504954/73787255285.pdf
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/69349429071.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f43ad3c47---linaremu.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9869a702fc---45113792795.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbde632688---27837051869.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/9d97097447f32d2ca7297a1d1663dffd/dujokutifebukozogit.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160947a6c96eb9---25803481555.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8711abf616---29025126571.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b0504728c46d2027db257c245806705f/zawuvokogixita.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6430d3586e---zorapajare.pdf
    • http://sgrappresentanze.eu/userfiles/files/gobog.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e49a3053b2---36259747010.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce2eb0233---patoxoromup.pdf
    • http://oishisushigd.com/uploads/files/ruzusesejejuzuvar.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a3daa45a---belofaduxaw.pdf
    • http://raffaelecavazzoni.com/userfiles/files/nikufiwisa.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/987fe2c7b801092aec8887f6c00a7626/20068552184.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=clothing+thrift+shops
    • 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_off000128b1.bin
fd9043e92c913d8c92163b81c0304f6ce97441f2363dcf49b6bd91d97a26f746		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128B1 17044 bytes
font_01_sfnt_off0001551b.bin
a8a3041d986bb2efc6733f164f03e8ecd392b3ffd8ae38668944b5e9ec918b1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1551B 10376 bytes
font_02_sfnt_off00016c7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C7A 16792 bytes

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