Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f82115cb6d7ca4…

MALICIOUS

PDF

85.3 KB Created: 2021-09-01 21:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b188c4185a3e83136d96a897b1b174c SHA-1: 5580e92dd8c97cf6bf965e9da1af9c50949eed60 SHA-256: c8f82115cb6d7ca4490dd12a4517c48a318cbd1c0ca3724f5e8ab0749cb2ecf6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://medvor.ru/uplcv?utm_term=the+difference+between+independent+and+dependent PDF link annotation
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff6fb9738f---19119382587.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/zulodefitelivudabo.pdfIn PDF document text
    • http://www.toptehnik.si/images/92390506934.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/1bf502243f0d299ef6f2d942d4afb012/34694394775.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/4q8ingh4u47jib71pskgo6irk8/36386952715.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ea935b0905713e0fbc7014715540638c/novumozavemumakiwezuki.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd2e404862---dirilekosezos.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160895ae7df606---mujawiwamotupupobu.pdfIn PDF document text
    • http://bndweb.nl/upload/files/dejovefibowokame.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/j89c0elhbqvdrd9e1uhtroeto8/68749654274.pdfIn PDF document text
    • http://fields-on-earth.com/23383190425.pdfIn PDF document text
    • http://webursitet.org/Files/file/96564207183.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081cb3b14022---58401693839.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/jorowazuwawe.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/bivudokozijowerekeze.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/63414784921.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/najizusesixotowizubir.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/63784982719.pdfIn PDF document text
    • http://dmhfamilyreunion.com/clients/4/44/44eff64e497b984d8b2945277059c9c0/File/66573105705.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/1667186986.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/busenaxeratododirapun.pdfIn PDF document text
    • http://sung1.com/upload/files/vomumuxemugebikulonutane.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_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001008c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008C 18632 bytes
SHA-256: 70e4694ad34c97f87e142fed696dcafa262504d08fa197d448c3074639ff0153
font_02_sfnt_off00012fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC5 10572 bytes
SHA-256: 32aba588d8dab1a0bfa5d4b3ec11491e4c457f19c562ff9d9c0fa6bf9c618687

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