Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a5d3cc29234ae8…

MALICIOUS

PDF

41.4 KB Created: 2021-06-14 03:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8ca8e53a6a1e054c6d9c3a182a174a70 SHA-1: dc84d73e54f012e16bf7b646c310b34fcf360c7d SHA-256: 61a5d3cc29234ae8f311ddc9ca40e67a42cea9b4718d762cc46d0db816f02020
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8113

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 41 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://oniceh.ru/uplcv?utm_term=android+unknown+sources+setting PDF link annotation
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/a299499a1a0a9faa4e03b1fa5b5f3576/69266103450.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/gomitunilapetijix.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8acb461f2---dajomixudive.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/11706197441.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/75a99fb37370525e5537a833e532f690/49237292757.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7p0i53pgb0nvf0mgj15tspvqr4/koxexejofitalexola.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/wukesagevixuvawodato.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e58c1a87e9---lovinogojelameligazinipi.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8fdbb183b---kizag.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/67be7cbbba2dde8b553ef417b7d9d8e3/19962858249.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/nuxumikijuwiz.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/muxinesovovud.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/ad1f7f22e88572b1d1db225a864d0f5d/makumuwosojowuluga.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/99131214642.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160705d8a963e5---72739904957.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/wesesemizaju.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a5054d078---javoraturi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b17684a9450---tizosedoral.pdfIn PDF document text

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