Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b46c24be4881cb…

MALICIOUS

PDF

38.6 KB Created: 2021-09-18 17:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ac70559cc6601b057a65c8446374b916 SHA-1: dde5eba0ad5bedb1f4c0a2d48a052d559f3d6689 SHA-256: 61b46c24be4881cbc6b42ce80283b932615a1092f1b4e2e51fb80043a8daef5f
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV specifically flagging it as a phishing trojan. The document appears to be an image-based lure, typical of phishing campaigns, designed to trick users into clicking embedded links. These links, such as 'https://irlanc.ru/uplcv?utm_term=will+vs+going+to+exercises+pdf+with+answers', are hosted on various domains, some of which appear to be compromised CMS uploads, suggesting a broad phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8588

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 38 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://irlanc.ru/uplcv?utm_term=will+vs+going+to+exercises+pdf+with+answers PDF link annotation
    • http://kaztelcom.kz/ckfinder/userfiles/files/nutojajedokite.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/14023437636.pdfIn PDF document text
    • http://synphabase.ch/upload/file/4121770219.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9880e2eaf---88592717727.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/lilaxudaz.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/25803558879.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/33c0a3eb6eeae8c068f11558a751d7bd/kusanuki.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614052d94f695---ponovixeguzuvezoj.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/kepiwukokezesepusa.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161362fd0d81d7---disetop.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/39523143899.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/28568293603.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/dalanajopelek.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/22718947740.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/phpIn PDF document text

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