Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b16b528f4266f7…

MALICIOUS

PDF

76.2 KB Created: 2021-08-14 22:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af8f76b7bfdf2cb991911c7d4ee33280 SHA-1: 3d86307a22ea0cca5953510c96c1fff2f1a93d26 SHA-256: 51b16b528f4266f77d04024ff54bf2a35d47b00c790fd5259ec9a508dc02e2c2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to direct users to potentially malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to redirect users, likely for phishing or to download further malware. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5474

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://cructi.ru/uplcv?utm_term=does+verizon+mifi+have+unlimited+data PDF link annotation
    • https://eatorhours.org/e-bussiness/fckimages/file/zajore.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/xenamit.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/52469745814.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/23794687700.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/molaxen.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac22114c062---38762184037.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/53825448056.pdfIn PDF document text
    • https://andrejc.si/files/file/keguriximetoroxu.pdfIn PDF document text
    • http://medrea.ru/upload/files/talamizapurudizebir.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebafcc6a6e---71098894203.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/dujudufomijewupedug.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117e64f9f7e2---24674001994.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/55145131342.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0f8d962c88bec94003e9c238ece07e00/xivuwu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3194069993---zitowewil.pdfIn PDF document text
    • http://premo.at/userfiles/file/63511169505.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/raganigenejarosexapoget.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/26776063284.pdfIn PDF document text
    • http://www.polni.si/Images/files/69364827056.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160ac656d70d1f---disunuzozegewerabeg.pdfIn PDF document text
    • https://andrejc.si/files/file/fepawivasu.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/xowuxajojetimidifuziwugor.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/1641583d2e29e6805382d26612c438b4/deriwezedomipojedo.pdfIn PDF document text
    • 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_off0000df2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2C 10844 bytes
SHA-256: 2d190a205f732bcbaad17997521729147befd24e51d3825c47b1433500705b3c
font_01_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 17728 bytes
SHA-256: 0999086dcb3d7cc6a100902bd4c999bd58857ec7a52b799940c4acc3027ce11b

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