Malicious PDF — malware analysis report

Static analysis result for SHA-256 273a8fedd3926170…

MALICIOUS

PDF

118.9 KB Created: 2021-07-05 20:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbbbde0be49baa18c9515a54faedfa93 SHA-1: 7e00ab7b3f738bc286c8121ea211c6b4fa1ad998 SHA-256: 273a8fedd392617078ec5b9e2b871f908cb148f1f45efb1502cfedee33a6720b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these external links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://fo-prefectures.com/pages/files/38225589625.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7vi34oeduprovh7hd2fhp94j3l/sejenibukimevexamixam.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/0403ee8acce29d7bbfee887b9ad8b794/51097660133.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/fa74d9aea39c93ad8f2c05234486e760/54225783563.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/5j55drrqmeqbap7fitk7cencge/66254751317.pdf
    • https://alshamiltrading.com/alshamilfiles/file/72056697327.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ob802ba6n5en5cg84hm097dmmp/35220485434.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16080b72f884b4---95317383838.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/a2fkm4mecersf5mh7n2oovnkah/58990724408.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1f521e91---83155995766.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc6c1d506e---63791317155.pdf
    • http://bielwod.com/userfiles/file/lisovulavukuf.pdf
    • http://ciaooo.ru/uploades/userfiles/file/zagekizojuwe.pdf
    • http://andlupa.com/userfiles/file/22792132474.pdf
    • http://massageindex.nl/images/uploads/78161787998.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/3918441f35a1e19a916f5b957b52a8e8/16472346588.pdf
    • http://erictex.com/ufiles/files/16385958129.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075f75fb610a---99464377619.pdf
    • https://vestol.bg/files/file/pafumuxab.pdf
    • http://eia-edu.com/userfiles/file/jugajidagemumixavi.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/32879623075.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/c9cf6e5a058f5303966e8275720e048e/riliwikajuwowagi.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/7f4e12927734ac6268ac7fdaf002f50a/garozugoxujoseporufotix.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c9bf5264d---76587315454.pdf
    • https://hitpoint.tw/userfiles/file/menibexo.pdf
    • https://wendi101.com/userfiles/file/kakarebozekivirizeke.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+wax+museum+reading+answers
    • 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_off00015e6e.bin
b3dc145a1006bda2b32b1d3f695336e1db9b04ac5ccdc68fa9daa2482987cbb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E6E 10684 bytes
font_01_sfnt_off00017685.bin
99b2f2dfb7f77bfbf669e1ef83a80a86dfe7d6524c5936edc9592a5c38d58cad
pdf-font-stream PDF embedded font (sfnt) at offset 0x17685 32844 bytes
font_02_sfnt_off0001b473.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B473 16792 bytes