Malicious PDF — malware analysis report

Static analysis result for SHA-256 d271d10f8ecc9155…

MALICIOUS

PDF

88.4 KB Created: 2021-07-10 05:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07dfe453b3cb68a689b4a790ed72cfd6 SHA-1: 35a0043f8d7a9f52eaea328c375b43d4cba20a7a SHA-256: d271d10f8ecc91556dc41f8b82bbb80ac4d05077c4b21d5fb52d61768edfca64
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. Several URLs point to compromised WordPress installations, suggesting a tactic to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=prophecy+test+questions+and+answers
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f2bb6415683fe7a6f2d4b3e9b7a98717/10079003102.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8b3ea31cc---dipebolurakitaxirokugasem.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/33c32c52d21314ab9a2065abfbe2c496/dogazolebefapivifasov.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/qbda2bb2r7jiklgicg97ttajs0/jivepo.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/78unthogk5bn1vor5pcftppci4/kirevesobijilumo.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780f5871541---41696264932.pdf
    • https://banghenails.com/upload/file/40482034135.pdf
    • http://kapsalonindex.nl/images/uploads/9183969177.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1e30962b8398eafe64ce344989f52622/galepubenuzizakol.pdf
    • http://aceonlinementors.com/userfiles/file/34250427497.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7f9c8e8a2---48290589475.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/njke5c0625tmcvj88etheh2ejk/25422060364.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075c60a5322a---pefuworelozejawoxekososov.pdf
    • https://balaji-technology.com/userfiles/file/80424426914.pdf
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/nufibivaboredu.pdf
    • http://bbfrontedelmare.com/userfiles/files/69178608481.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a67bfb7acdc50d94d32121e2f67dc936/zenux.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/1680b7eb7473201445dc3bd00caa4a2d/dejakukenafaleki.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/p3f3fa518nis64b0s5jn8ss7f3/pidagelanekeb.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/kupuji.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2b6792773---5851997639.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff0e3f327---61736439615.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1k2v8lhnm6o1h6vih89fh3cl3i/sudokulo.pdf
    • http://derkwoo.com/upload/editor/files/23051399530.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe50fc0a35---35365262273.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_off0000f3d7.bin
7c9309f0293ec97897613cddbea3cea033773fabcd790e5361cc5ba06c064bd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 11012 bytes
font_01_sfnt_off00010d43.bin
600c89355ca673c3feb49f705be24ad9f28cf4e0002aa49b0d35bbb501a3dc6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 17840 bytes
font_02_sfnt_off00013c56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C56 16792 bytes