Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd16aff9fbe0a612…

MALICIOUS

PDF

89.7 KB Created: 2021-07-01 13:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d2a8304c2cd5e2eedcb1071071b0689 SHA-1: 39831430097b58d12cd1f80a242d0801880b8108 SHA-256: fd16aff9fbe0a61273bd7722ea0a732078ecd70fb20f40226528ba193ed16625
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of external URI links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=personification+and+apostrophe
    • http://files.ibiza-ferien.de/file/bopaxififaneralubupuseda.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b253e06790e28abf502a7695d1c1dc3d/ruraxiwipumeso.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9607bcfd418f5744448596382f4b5f2c/60021682301.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08462b4ce3---3927759119.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609f484f102ed---lexakowalavud.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608054d6b5a64---36029710670.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a63b918b82d---kewizezixagoludojawi.pdf
    • https://ms01bet.net/contents//files/wetaso.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d00b50431e4fd3a7a73b9372f676d7d1/vunoxixojimawapesurozaz.pdf
    • http://parkhighclassof60.com/clients/871169/File/76599472487.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba3631616e---wagelewakulebi.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/67194482291.pdf
    • https://gastriklandsbf.se/UserFiles/files/momibugutesulupuvobus.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160da0091d3ea1---kunamita.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fd5fc224a---kolakeliwediked.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/19d4500dc299d3c31b57158025a40d9b/49506240388.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e29705708---97424348689.pdf
    • https://alternativecarrepair.com/userfiles/file/92606927920.pdf
    • http://odpadykj.cz/UserFiles/File/36552713407.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/fc06dd7271ad3a3ad7feee7aba11f5f2/vabasanitulo.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/emlfkg1ebelescr2ouq0vpaov7/zelonavo.pdf
    • http://anhbanglaw.com/userfiles/file/lekimaganefimatojewapi.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/f2a5olc64fttrhcsrrjerhfau2/32278793117.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a9840136cdf---raxawukudi.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076602f9209b---darojagetaporegewi.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_off0000f673.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 16792 bytes
font_01_sfnt_off00010e8a.bin
270e74e371e7d9b44d9f57a476cf7ffd5e3a6f5bc21921d051bfd60c13f81c1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 10672 bytes
font_02_sfnt_off000126ee.bin
a27ece544e2b73c32dc75c532f974e5075b0b9108a5284de5ea4f1d705af6c9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 19268 bytes

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