Malicious PDF — malware analysis report

Static analysis result for SHA-256 46bc47045f62d61e…

MALICIOUS

PDF

83.6 KB Created: 2021-06-25 14:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df485bd9e64ed6d02a4cc9876b1d5b66 SHA-1: 397c0c4e5ba6bfa7b2a970a15532fc5455459468 SHA-256: 46bc47045f62d61e267e3de28e7cb05c8531b407aab50be3081a3bd0c431785e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://smidgel.ru/uplcv?utm_term=bible+verses+about+resurrection+of+the+dead
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/0446emeumsgktt2ipr7vao2pr0/57464545609.pdf
    • http://hitecds.com/userfiles/file/nopopevuxejuzokafaruw.pdf
    • https://o-dance.com/upload/files/21280276537.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/1c1ae2f9ac34d3e01f81496e60708975/ragofamerabez.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abcb567a214---ralifefi.pdf
    • http://tubietelbar.hu/uploadfile/94848269109.pdf
    • http://aldara-latinoamerica.com/userfiles/file/tejusikigofurixutijokele.pdf
    • http://www.heksan.com.pl/file/61150572824.pdf
    • https://atpl.aero/ckfinder/userfiles/files/mawemanerot.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b52e0fd8003a2058b8f363116ea8c1ef/sexuxabixogobum.pdf
    • https://moto-trend.cz/public/files/fck/file/31668296026.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/53b70ab7297b859c984f46a818f5a250/vumidilugeguzatesawelitob.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/5108064720.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc3bbc5e05---kavoxuribikisoluni.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e483.bin
7115e4d602102ec31a84d269fb5660b3685007d5bcc58d649febf449acd7c492		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 10932 bytes
font_01_sfnt_off0000fdcd.bin
49a3dfc23f84d6d2faed40640a51db1742ddccaf4b7deb48e7b723cc6b52001a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 16868 bytes
font_02_sfnt_off00012989.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12989 16792 bytes

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