Malicious PDF — malware analysis report

Static analysis result for SHA-256 17702d1354e8b533…

MALICIOUS

PDF

38.3 KB Created: 2021-06-11 04:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8a6c33a87a8393043c56bf9e9aeeba8b SHA-1: 57f2c39bba176e19195690847e24838ac4035e07 SHA-256: 17702d1354e8b5335dfc797992effbc14f2d51027c0fbb612ff35df1d3afb50b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV flagging it as a phishing trojan. The heuristics indicate it's an image-only document designed as a lure, containing numerous links to external sites, many hosted on compromised WordPress installations or disposable domains. The primary attack pattern involves tricking users into clicking these links, which likely serve as phishing pages or downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7192

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=memento+mori+jonathan+nolan+analysis PDF link annotation
    • http://buergerforum-tirol.at/file/69060334856.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4c074dfea2b786f6093ec0fd6d4448e2/49306343195.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608914708b378---jiragowelogajozigukaz.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/lelepotupemirevojiled.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/voxufefavenodibina.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/35946699559.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/38855a721d707ea21b641eb18e563691/47173177173.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe7064d471---buxuxumivoji.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/16378108375.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a18cca2d---numifebepifef.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b981523f94e---41330549637.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7uke4e7088r9robnt2i16jhslp/wozuvozeredogoreme.pdfIn PDF document text

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