Malicious PDF — malware analysis report

Static analysis result for SHA-256 336983a83691a5a5…

MALICIOUS

PDF

39.7 KB Created: 2021-09-05 05:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0edf686773a5ac92d8f1630a68447b99 SHA-1: e4fc0c7fa8ef63459300f713cf23f96ab1696a3c SHA-256: 336983a83691a5a5fd3554879df2a56e49f8ca76fc1a5df8b4bdb44629cf407c
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and ML classifiers, including ClamAV. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or malware downloads. The PDF's structure and content suggest it's designed as a lure, possibly using an image to hide clickable elements, a common tactic for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8821

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 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://crewmak.ru/uplcv?utm_term=esp8266+programming+guide+pdf PDF link annotation
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf397c325b7---23995491548.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/rajolarikevexalixa.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-4/20210704220914128497.pdfIn PDF document text
    • http://ahchala.com/img/file/24638554442.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902aa6d48e8---wezexafagotiriguduf.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e8da52866---4328253974.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a85060969ad---28987990307.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/98503750639.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/cffd13b68204c72b70061aa857f8682b/66850444595.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/1db80a6168e627a21b7a9d420e0dd8d8/12046848653.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814b371cd25---45124715045.pdfIn PDF document text
    • http://goref.ru/files/file/tomuvenodojefekogelosi.pdfIn PDF document text
    • https://quaint-house.com/58876241761.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qq78lqpq7lugcnbjmruu13ltvd/pitibagimisuku.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/dufuwo.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/zeduxexa.pdfIn PDF document text
    • http://iccarrentals.com/files/file/zazagalagimiwizibimudo.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/76300693712.pdfIn PDF document text

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