Malicious PDF — malware analysis report

Static analysis result for SHA-256 88611371a6f885a2…

MALICIOUS

PDF

72.0 KB Created: 2021-06-13 14:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 952b06b5b4f111fa4fdd67d973d8df13 SHA-1: 984a510d4bca07002d4ee3ac476164fcdeb9f8be SHA-256: 88611371a6f885a23c40bb595c4585a3c10e2f8a07abc58078bb1da91179bd9c
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document contains a link farm pointing to various compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware or phish for credentials. The embedded URLs, such as 'https://pistant.ru/uplcv?utm_term=mini+militia+latest+version+mod+apk', are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7776

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 https://pistant.ru/uplcv?utm_term=mini+militia+latest+version+mod+apk PDF link annotation
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/dd37d2fd27238dcaf404a8906adfe977/48401025570.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/20494748530.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a97a08122bbb641c6aac735974684b5a/3674196978.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083f86b1274d---dijunalorofudodov.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/76090090956.pdfIn PDF document text
    • http://petrduchek.com/files/jawediw.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7523f3e8c---89958433087.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160783cdfb194f---46650541745.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/8223464755.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/wurujakojemiparubuvotoda.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bda20b4e8---7542841669.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160714bd0e3fb1---dubapew.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2898040454---38535999958.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/up4r37tlquotvhh4ehe76ov8h3/vikox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 5232 bytes
SHA-256: 62b0694ccfd19ba5589bd52d3928152b5837326c2528774f572f7f6fe3768c80
font_01_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 10844 bytes
SHA-256: ebaa64dc4635c317b9c344de8e8b6c53d2cf7574b7266944697c94b34d91ec9d

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