Malicious PDF — malware analysis report

Static analysis result for SHA-256 2112fa8cd96108e9…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 13:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbc39d4a27bd77f84cb2714922facaf0 SHA-1: 928bbaef3a6824297b7f29ee65b9939b95fbf866 SHA-256: 2112fa8cd96108e9fd7dcf1df95089f5278dc4e6d694063268c58c49791e903f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads or redirecting users to malicious websites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=simple+present+of+to+be+exercise PDF link annotation
    • http://guitarenko.fr/img/files/80460177720.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210910153838501.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/97398321942.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/96970183627.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/87574154393.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/nepevumo.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/61921421818.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/91194158439.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/72364193923.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/gabiretitagapurojiladobus.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd5365822---xebuletadagerudes.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/35286748066.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7e8e5b918fd04d3c36845796d3ca559e/mibifemufutu.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/12167839783.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/3584253187.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/90150572929.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/94788881429.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/lowopisurud.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/pifeduramugonazuwuves.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/005260f677f97be7290c6862590a431d/laxarajele.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/32815302186.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6cf317c9cfdf4111452c9d81ef11980a/74301361223.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2864e932e---71276334018.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210923004939.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/nugazexefafukera.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/kujuruz.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109022011456385.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/98728914380.pdfIn PDF document text
    • 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_off0000b3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FD 15072 bytes
SHA-256: add578248e10d589982cb9dda9d5e6c8f092fe6b2ea7deee77e87e901022b1bd
font_01_sfnt_off0000da0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 10796 bytes
SHA-256: acb1c854ae65930f95bc0b0480b17290f6e64dc57394ce14ceca41ac9737b5e5

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