Malicious PDF — malware analysis report

Static analysis result for SHA-256 497161d89a4f0ec0…

MALICIOUS

PDF

75.1 KB Created: 2021-09-02 17:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2bfd1537b7b9c760838fd489530a0de SHA-1: 130f34db645935c6d20c200933559880a9b32d3b SHA-256: 497161d89a4f0ec01b594b3022aa5dcb18fab00b420c85c71c1fcd6417e0f9b2
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to websites hosted on compromised content management systems or disposable hosting. The heuristic firings indicate this PDF is designed as a link farm, likely to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7451

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://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/35079902108.pdf
    • http://renovfab-menuiserie.com/userfiles/file/74396156183.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1c181c742b26d11694d29255c60c57b6/27918202481.pdf
    • https://renetravel.ro/images/files/kidupitonenoneterasupuza.pdf
    • https://ans5680.preneed91.com/upload/files/50102263445.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb4c128724---judita.pdf
    • http://kochamsushi.pl/UserFiles/file/59470508287.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16111b229da21c---gamewikuvanawopukudegos.pdf
    • https://kisikana.hr/userfiles/file/44413326807.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609238103da40---mitoriwixopot.pdf
    • http://tsrmvolontari.it/userfiles/files/81646713612.pdf
    • https://relans-nn.ru/images/docs/file/mitosurumolofubozafatuguv.pdf
    • https://epiphanych.com/images/file/56443326861.pdf
    • http://bainihu.com/upfiles/editor/files/resuloralik.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/tipoduguwefaromukusez.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092e1f5e5fb6---gotifuloxilagiweroxe.pdf
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/38614126110.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/45a0ee58650f76e50f2caa057f12a500/70645669247.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/novukegojefexejukoseb.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e94b4ac5e---xabezizufavage.pdf
    • https://nffcd.org/userfiles/files/1178361392.pdf
    • https://autotronics.vn/userfiles/file/dazewijodipokaz.pdf
    • https://machinex-machines.com/UserFiles/File/25825139811.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pile+foundation+methodology+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 16792 bytes

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