Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89a5b26c58a1e4e…

MALICIOUS

PDF

39.0 KB Created: 2021-06-07 17:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2fc0dfd24523b5a824ce9f269d954672 SHA-1: 4e0f0c493c87e0854ac309719fc0c578484dc2b4 SHA-256: f89a5b26c58a1e4e6b2ce29566e0aeb45745eceb6bce9e8e8efd52e35a0d091a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, directing users to various compromised websites and potentially malicious URLs, such as 'https://drafthe.ru/uplcv?utm_term=discharge+letter+hospital+example'. The document's structure and content suggest it is intended to deceive users into clicking these links, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7465

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 39 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://drafthe.ru/uplcv?utm_term=discharge+letter+hospital+example PDF link annotation
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb634757528---jovurejulamefifezodedos.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/nulinavedotaxawidatakak.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/raxapuselusifi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3386371ecf---lexijokokejinajizagaj.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/315e91b8fd4e145f081cee395ec321f0/42770446781.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5df2f19b02---10714774057.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/rusojovorarug.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b86e0e9171---56121190655.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d293dd15e1---35610922854.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d531d8e94---47909408133.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b462985148d---nerifijonunobuvogejasaxo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/tosilesizi.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/852b3b4e0d3ae0b325bacb409cef7534/nedafakisoketuda.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/bogotifuzaxenukogogen.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/d82282c649505b805abd7904327bb954/memofexutivodaxebuninol.pdfIn PDF document text

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