Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61291ef9a6f7ebd…

MALICIOUS

PDF

74.9 KB Created: 2021-09-02 17:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: acd819b77089cb0b4778cd23b65af855 SHA-1: e69f4084017f43d9845fb2714810e97f5d94741e SHA-256: b61291ef9a6f7ebd0535581b4726189883b36ffc6271db8534712dbbddf80182
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan implies an intent to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7739

Heuristics 5

  • 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
  • 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 http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b7a7d16a7---jivavarojogikimed.pdf In PDF document text
    • http://sushiosushi.com/uploads/files/narumefik.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/18958517536.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b27d663d481---85392183319.pdfIn PDF document text
    • https://afayl.com/userfiles/file/bawovofepa.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/seguta.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/simabupizus.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/5041mvqcjqpv7ivl0qog7fqdkt/sizudubire.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/levamewa.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/rikemumapefawesavafuz.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/3ptl19igr01h1keesb639rkpm5/riropupezorumije.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/752f2b8053d835cdf126e6d077efb52e/98806455496.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160966c8758643---foxexapov.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bddc234661---87446890977.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ec79da67---pebedovosumijaxasiwavip.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f0d57f442---97170531875.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e38ee5bce8---miduxagemufupi.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/fizesavagusaripasepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=simplissime+%C3%A9tudiant+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 10768 bytes
SHA-256: 0e3dbda27e0e91f865b8a7d89fa3d7687330be50c863540579e98062b43126e2
font_01_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 21064 bytes
SHA-256: ab369a20b425c6191d525be3b429483df8893e3157f23f3044f0ada603444675

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