Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2221af7fb6675c…

MALICIOUS

PDF

82.0 KB Created: 2021-07-03 09:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5a627e4139781ebc601d3944e4ce6979 SHA-1: e7d7a1654742aa394c678460fe2b68e58b186c60 SHA-256: 2f2221af7fb6675c825610ef5c4917c8f4ce70d7407df7a2fdd2606a523b6f14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it functions as a link farm to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962ea42a4c8---80100359485.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa8445dc7---fipojuvibip.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2e1442236f31a8b74fc0c76ac453009d/gonozuzozukuvej.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1b36253f19ee628e3bebca0d1aefcbae/bovotulejofa.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/t2n7gachsmlr1636oq7lsqh30v/17706089775.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/zazipiviw.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4fee49cf886bf3ad8855260b8f42edca/lakunezolurepusoziranif.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/h9h2a07j6ika6hrve7gl5be96n/fonikiditafevoxigoxi.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ff8272df---lamumepidu.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cb4f44775---51204337369.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/64784070809.pdfIn PDF document text
    • https://koratspring.com/upload/file/55862210124.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/duzavimokokijiroxuvi.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091dd882573b---notijexuzopojenit.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/74130239944.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160847d6282272---kabaderiwek.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9da1e6e4b---kumorebipanut.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/e6dhpsjm6fvektrnsj1v04jcn2/rivugefof.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24ab109ae3---96360829176.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/91137904531.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/mekewixuborakufemoxuzuxen.pdfIn PDF document text
    • https://actor-conseil.com/files/file/33239527404.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/levaxemuzemeferagowige.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/majeja.pdfIn PDF document text
    • http://turnyras.lt/Files/file/fozedotunuwewaluwikibake.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/vulafiritotomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=big+time+rush+watch+free+onlinePDF link annotation
    • 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_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 17336 bytes
SHA-256: 9de83a428bea9af4aef1bb32d36e95a1ddf8753328d280c9f62260a76ee27a5e
font_01_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 11020 bytes
SHA-256: 407db3ec6e59aa709dc47f7ce6bae62a901dd8da09bc5295aa9d05dafe16d1e0
font_02_sfnt_off000120cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1