Malicious PDF — malware analysis report

Static analysis result for SHA-256 31767e5957ef221e…

MALICIOUS

PDF

42.8 KB Created: 2021-06-23 01:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9817e160afad79ae938d731a014ff9ee SHA-1: e3a3435760ca538bb5a1cf1fa5c62d97d3f4f2f3 SHA-256: 31767e5957ef221e5f36eb72f5b5c0bc532b69243446aa70bf350015a6fc2a20
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-only design with a clickable action, typical for tricking users into navigating to external URLs. The numerous embedded links point to compromised CMS upload directories, suggesting a distribution mechanism for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9340

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 42 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://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804b7058ac4---9604775186.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1071cb5fd4772c8829fd88cebb189229/tuselixebinutavokitu.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/puzimoxinamowokesiwepo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a33801cd7---tamiwinavipube.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/rarumipo.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/lutizakosenalisigemojo.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf4c464a58---22412770589.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/cd73754babccbe3a50e3334c54995595/fimakufuxixib.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efefc4b66e---tugisonuwe.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755ac6cec51---fovokesedogixokobax.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/59090039844.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/81617688229.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/24104825272.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/56cbb1cc2c51474895382ba3fc5b17b1/pazuxunaxixudonavujo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb0e3af9f---3605398217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=national+fire+alarm+and+signaling+code+pdfPDF link annotation

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