Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfe26df3d32c4ac…

MALICIOUS

PDF

90.7 KB Created: 2021-09-04 11:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cb60071fd417de7cb798a92d5d4d56e SHA-1: b4cd4547de4c8713bdca32cedab5a40c8d706756 SHA-256: 2bfe26df3d32c4ac2e043f29ecdafa877d4a29c4d029564476aae3b1337ec537
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various domains, several of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=timex+expedition+indiglo+shock+manual
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/nefofanezanafedavafub.pdf
    • http://turnwealthy.com/ckfinder/userfiles/files/gazeze.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/0a148fb47ab844f8063065f0b334f5e8/29053967994.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609156400a0a0---kexonobubezap.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fffddeb4162---52154246176.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d38182926a9---dofakegaxide.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610621aa0f411---nonuzolibizikolaj.pdf
    • https://netlandschool.cl/files/42284592262.pdf
    • https://bamor.org/userfiles/file/26637445469.pdf
    • https://cengilli.com/icerik_images/file/36591020385.pdf
    • http://swotaweb.com/img/upload/file/988844557.pdf
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/46253026463.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadd6bcb9e---82741760455.pdf
    • http://keacg.com/upload/files/lutogudexurugitobemiwijof.pdf
    • http://fluidearthconcrete.com/userfiles/file/19647852126.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107aa7ba0ed5---pajopoduleposu.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b1fe21edc---tizofiwofopevakase.pdf
    • https://udruga-invalida.hr/files/75407823230.pdf
    • http://jyjwqj.com/uploadfile/file///2021062302421968.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/01f9b181db0f7a9e3b7366b2533c3432/pajitazugata.pdf
    • http://mixline.ru/img/lib/file/gidubo.pdf
    • http://avandcie-energy.fr/ckfinder/userfiles/files/tetisipejowuxeworemivi.pdf
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/fapas.pdf
    • http://summithigh75.com/clients/867147/File/pisixesavefumeselozam.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_off0000f547.bin
79a8c386249d65b7985c1072ec62e155af9113cb0ee812038cf5ad1fbbf79824
pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 20720 bytes
font_01_sfnt_off00012ad1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD1 16792 bytes
font_02_sfnt_off000142e8.bin
bea847e9ca61c47e916e5274c65cc17dae3830ba47fb8de94ce831e2e93d0ff9
pdf-font-stream PDF embedded font (sfnt) at offset 0x142E8 11120 bytes