Malicious PDF — malware analysis report

Static analysis result for SHA-256 2989d890bb01774d…

MALICIOUS

PDF

73.0 KB Created: 2021-09-05 02:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed270bf89034b9d0750563d2721c3c30 SHA-1: 6352565ad3892d2787b437d00cbcead0dc4c4502 SHA-256: 2989d890bb01774d642ab5f90e9f72b97eb685c33627820dd7b98b572c7e9a46
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the link farm heuristics and AV detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://svx.su/ffile/file/81192975542.pdf
    • http://xedaptheduc.net/app/webroot/uploads/files/nenekumirut.pdf
    • http://hkbroadwin.com/userfiles/64689986039.pdf
    • https://fl-forever.com/upfiles/editor/files/segogogaworugi.pdf
    • https://travelone.ae/userfiles/files/33643313718.pdf
    • https://northcoteplaza.com/userfiles/file/gejukukiwa.pdf
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/51447463822.pdf
    • https://oceanflowerhotel.com/uploads/image/files/66537772607.pdf
    • http://jfac.kr/ckfinder/userfiles/files/38371508101.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/5fed8bc3d53b5862134cd542a0af5086/88462516203.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a39d3fd4d6c---76107818045.pdf
    • http://shangrilayunnan.com/ckfinder/userfiles/files/84023659928.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d098f2219---saroterakenabizosizomudi.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ba20d77991bdd7177749dccc0f6ce8d9/sutuv.pdf
    • http://praguetransfer.com/files/file/95645276625.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/gjojej10u3n720abp0eh2kset0/7495277346.pdf
    • http://ssaisarang.com/ckfinder/userfiles/files/46363186670.pdf
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/kevugozitu.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/8dc63190f5ee429efb95addca99d8b23/fijezelepifanopo.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160876c8ca1d10---38710777959.pdf
    • http://adabaskimerkezi.com/upload/file/75074628394.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c5785dd5a---lerawajabaruxavamuvid.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/3fadef8685ab9b317baa541f4a4e1d36/kajelagejosud.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/85475058179.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ipm+pest+control+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_off0000bda4.bin
20f19001c91cef0d2c837e582bd923a77da44b210859f30205e18296cc9c6de5
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA4 10476 bytes
font_01_sfnt_off0000d567.bin
88b2a78f9593434936b175179108ad32a36a7a908ef7bbe5d29bc3505cf511a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 16300 bytes
font_02_sfnt_off0000fec3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC3 16792 bytes