Malicious PDF — malware analysis report

Static analysis result for SHA-256 722ea279644b39d3…

MALICIOUS

PDF

69.5 KB Created: 2021-09-12 18:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7daceaf6c92dc740dcfb62dd22e08884 SHA-1: 6c22390e69be12be1bda8943f02f2b65340c2b18 SHA-256: 722ea279644b39d3b8f30a578716ccec61307ac23bcec930d8ab1e8dc5bc7257
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, and ClamAV detection confirms it as malicious phishing malware. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=addjavascriptinterface+not+working
    • https://gea99.com/ckfinder/userfiles/files/pujubaretizikozilotu.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613df1ba1b543---70910175131.pdf
    • http://hattingtoemrerogsnedker.dk/userfiles/file/69944199801.pdf
    • http://aotwcasino.com/ckfinder/userfiles/files/patasixalukovi.pdf
    • http://guides2alpes.org/uploads/file/17320040980.pdf
    • https://promise-land.com/upload/file/gatuxugek.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/bcc2faa024601d488edb01f4c7f666fd/wanutisi.pdf
    • http://wamer.org/userfiles/file/92811360001.pdf
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/jinino.pdf
    • http://gesundezellen.de/neu/userfiles/file/47989405990.pdf
    • http://braghieriarchitettura.com/userfiles/files/bikuf.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e196d4bf4d---viladenoz.pdf
    • http://ogledalata.bg/uploads/pages/files/82436873607.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ffc78791db04fcf12d2091675e6157b7/12750287140.pdf
    • https://poulinstrapscan.com/userfiles/file/gobubivodalub.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/zusemisodanisemuguso.pdf
    • https://sandipkumardutta.com/ckfinder/userfiles/files/70420175753.pdf
    • http://kesherisrael.com/uploadEditor/files/detabulopunupiv.pdf
    • http://traiteur-ribot.fr/userfiles/file/90406746851.pdf
    • https://ibericadearmerias.com/file/punevuwumitavasavibin.pdf
    • http://komputerzagrosze.pl/userfiles/file/mekadujasogogiwumurof.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_off0000b15f.bin
85edf36e06982f1044990b7ceffaaaa5f6ca197d4cdca00defa5d397d6ffbc61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB15F 15056 bytes
font_01_sfnt_off0000d779.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 16792 bytes
font_02_sfnt_off0000ef90.bin
1f2aceeae65c8ab68f982b49fdf5807b8cbbce715a0b7b3336ab4ec37798dbe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 11104 bytes

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