Malicious PDF — malware analysis report

Static analysis result for SHA-256 18af1f6cfa5c45a3…

MALICIOUS

PDF

38.7 KB Created: 2021-09-05 07:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60da683a2b7342622cfe6d22352bb89f SHA-1: 1a5607046eff01d0491ff9b09be6f9e6c5c191c1 SHA-256: 18af1f6cfa5c45a31fb3ed30c8c7597d48e053b596ae8224c33be4a217fc3045
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 detecting it as a phishing trojan. The document is structured as an image-only lure, typical of phishing campaigns, and contains numerous links pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8501

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://pistant.ru/uplcv?utm_term=soft+heat+electric+blanket+manual PDF link annotation
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/fc38ae229a47b75ef6567161b726edc3/xasazowa.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/sanixoxiwivikagububix.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/11111133621.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/runupibiwipaxufopisudo.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/fidip.pdfIn PDF document text
    • https://castel.ro/userfiles/file/46479098744.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/63970074194.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/125c248f17f8481411a1269d14f85a7f/57743273558.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40b84e9de9---zobidaj.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/worabijuzafugon.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9916727fb---7208204921.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/14612228103.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c367f3949c---4In PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/594dd2f350d613df59537eef769c01a1/dawevow.pdfIn PDF document text

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