Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45a0c5935bafa9d…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 19:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9894b687678ae027886d21866b14a9f6 SHA-1: f6ac222da6dc32f0263f4140617f9e3453a84891 SHA-256: f45a0c5935bafa9d93fc662af1375068560b15b7b3d0336cc9967e8c5753be33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://emilline.dk/ckfinder/userfiles/files/64753337800.pdf In PDF document text
    • http://bioaec.com/userfiles/files/nenub.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1720b35bc---53591647859.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/92721151521.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/wenivorikikuvepa.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/6093085263.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132eb8247e31---14461630931.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/85984794672.pdfIn PDF document text
    • https://betsin.org/userfiles/files/55192334463.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/25509496800.pdfIn PDF document text
    • http://sieuthibds.net/images/files/xipemegosipovimafo.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4af13d193278135e709a300ff89c932/97829556836.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/71475426604.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/zimimejevupedexosubub.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/58637614540.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/vifajabulawa.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d0da76b2bb6ffdbc8a05e79082d78441/xeliguxaloxiw.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/42679604010.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/34n4bp1go5ek1bed455b0df7c4/solobemo.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/19480199592.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614224643efc7---dikope.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/wugojibabutarobedaba.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130819d78dd2---91497589828.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/86730480918.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/furivajop.pdfIn PDF document text
    • https://razredna-nastava.net/files/3814869519.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/12812210993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+download+files+for+ppssppPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 17216 bytes
SHA-256: f1c108101027edb6917901a18cbda0f62e2b6e7bdefd57c398b6405c5358c5d7
font_01_sfnt_off0000fceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEB 10568 bytes
SHA-256: 7c8f28bf247a05ea9ad256889424a2b62a990d35ac5a6b17e0bfbd5dc1c3ac2a
font_02_sfnt_off00011524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1