Malicious PDF — malware analysis report

Static analysis result for SHA-256 e06532367902a2d2…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 06:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a3f56024fe7d08127e739573e4a6d5cf SHA-1: f7ff33c4ab5f432ff4a33667c457bce396129429 SHA-256: e06532367902a2d28fc5ed9c1de45f07053f62e1f203cc019333dec593f5963f
156 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to external sites, which could host phishing pages or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=a+return+to+salem%27s+lot+123movies PDF link annotation
    • http://phantasos.org/userfiles/file/52794073058.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/dofisuzazevozaxoluwov.pdfIn PDF document text
    • http://mastervin.ru/files/file/jibimatomadotarolajijune.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/kipinalobimoxojuzajuma.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f07eee32bc699cc1a8943821a752f42e/1943621095.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pai48s5gbbnntt6j947eugd387/xakozizatojimekavu.pdfIn PDF document text
    • http://yejida.com/userfiles/file/25514705272.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/wuzivemoridut.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/20270203180.pdfIn PDF document text
    • https://campermagazine.tv/public/file/29397132429.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/50148851969.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/zepabapugepepi.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/96obb0jp9nb6sl3c6v3iuvi6sn/wuvesudafumudav.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/3663235603.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/44680550761.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/73403439623.pdfIn PDF document text
    • http://davcpundri.com/css/file/55897831565.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/20906181758.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/lomafewuso.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/38366994746.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/60353860347.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130ce7a2bfbe---89680491385.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_off0000ae5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5D 16756 bytes
SHA-256: 4dc98d7fb0551df9e8a4cea51b24ab450e3718f8fd3cd1794f00431f4ac29e82
font_01_sfnt_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 10792 bytes
SHA-256: 52119e613f0e999b5a6fe74fda3a2f1da151d77c7b6c85f8f81d5b32627ad5bf
font_02_sfnt_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1