Malicious PDF — malware analysis report

Static analysis result for SHA-256 9009bc533f398c6d…

MALICIOUS

PDF

101.0 KB Created: 2021-09-03 11:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cabcfc90618e16fac87c56de24917f93 SHA-1: 0b765dd3c98a179c4eacd4864e6e296b09227a2b SHA-256: 9009bc533f398c6d3a89a7fab98a5d476a11714ded55affe365026a71405890f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, but the URL patterns and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=yamaha+psr+290+manual+espa%C3%B1ol PDF link annotation
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/75bb9ee83c2bfda3e3540a6b8e9675c7/98794276268.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/qtbmei032a1r32j10o6s7jvdj0/wemeniveseke.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/66142210388.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/37957364230.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/wajawezakavubigagana.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/97928436245.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/gamipewabusug.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160833b6750b60---15059385919.pdfIn PDF document text
    • http://topstec.com/d/files/ruxerum.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/76555656008.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/767ed0b642630998de9de02d9e9a40ec/felamabonakilevudolor.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/41906951747.pdfIn PDF document text
    • https://sitarasign.ir/data/file/xidizokiwomes.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zarofawunomag.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/xufomimetefanuzojugokekom.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/miselosoxakazojitamil.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16816649435.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/gomijebogibokokowatobap.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/97172649241.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/88874106895.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/72b6ee30abb6361cc716b9f8b9fd249c/sazogumijap.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/zenebamixezidufin.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_off00011cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EE 11028 bytes
SHA-256: 47ac06568e168bf49049c8b78aea4f10a24e0b906b05b401a11a1b3b30e4d933
font_02_sfnt_off00014e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E22 20964 bytes
SHA-256: 794c40884f96ee1364b10ce9c3d4c2d4d79da06b8cc74052224fef84e7fbeb83