Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ba8187df9f1977…

MALICIOUS

PDF

73.1 KB Created: 2021-09-29 06:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 987b616942b56068dcef7a0cc2b6c8a2 SHA-1: dd4e77b6e7a032fd90ce2fcfdc3d44c2ad25a512 SHA-256: 89ba8187df9f19778363638e133cc5acad29b330f9c96db68c2be8e3161eca93
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to disposable hosting. Heuristics indicate it's a compromised CMS upload link farm and a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=android+xp+emulator PDF link annotation
    • http://bwemfjhjk.friend-match.com/upload/files/30100040815.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b135b0f871---3875268196.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/22925235280.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/rakozulopo.pdfIn PDF document text
    • http://uhorder.com/upload/files/nufejolujozojodat.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/84600050977.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/tuxaridagevotufurapibez.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/bonovetilitufuji.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/20792296369.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/78760863804.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/dfbc9baa89c592dd5e4167d64a44ab98/fuzovazebupawedi.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/63892229363.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/linafowimupalud.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/74596102228.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/jixer.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/devesunekuje.pdfIn PDF document text
    • http://jpiano.net/userData/ebizro_board/file/16654527117.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/98262389972.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/jewemipoxuxutet.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/97312970679.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/kagifezutigijetuz.pdfIn PDF document text
    • https://tepihtrava.rs/files/57127618573.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e4eea0e7e3d732d0ba11ba177460e351/22922832863.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614137c889e6e---42412137552.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/xebituvipaboxepawerife.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB767 10568 bytes
SHA-256: ff59766f260e4d9479dec63b3c91dec440f27ad883ca5cb50089f6577ea88c30
font_01_sfnt_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 18336 bytes
SHA-256: c02f36ebb5be4ed7716b12ef66fe9d11578946d4307a0d44d17fd3dd2c59dc7b

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