Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d91e8319fdbe44…

MALICIOUS

PDF

71.2 KB Created: 2021-06-01 02:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c0a8a2d9a53eb878e71253c92b7d1fc SHA-1: 7277b37e1dfbc42aebac4057b07daef9a45e7a6d SHA-256: 84d91e8319fdbe441ebfa70b54a7dcaa22c4b9b0961783ff49f43ed510cf48a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://allytemp.ru/uplcv?utm_term=manual+apa+2020+s%25C3%25A9ptima+edici%25C3%25B3n+en+pdf+%2528espa%25C3%25B1ol%2529
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9a926096---godele.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c4c395efe---99870728749.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66b16987c2---56437735518.pdf
    • http://saovietgroup.com/upload/FCK/file/79920146232.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a891252f621dd5ba9c2d5fa5b347f2c5/8195224468.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1dd983e0f10f8768fd374e29b56937a4/2441686380.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f838465759---89143904228.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/k1uiv15s3gni5ckeuu2glib7e9/wanejawanukazenidepanumam.pdf
    • http://morgancountyoh.com/userimages/3741521160.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/13fe34572a09ea8c37bd221a9293f8de/58498191550.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/1d26eabd582b2dab2a3dc3a2af7ab898/xidutesareb.pdf
    • http://brainbond.ro/userfiles/file/fazuvafupebezemununop.pdf
    • http://zuche0551.com/upload/file/gusilusimevowunib.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a526c61a7e9---3522138534.pdf
    • https://kermoulin.com/userfiles/file/pulet.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160805a456435a---webamolalitezipoworotog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d766.bin
5d34899c5d417eb17d4b80fdb1a4c8f43b7f9a17032106d5545f406037fb9f8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 6128 bytes
font_01_sfnt_off0000eb87.bin
f6d3ea115f0f13ba6a2dbde546c455b783d4132caa93cfbed3d1652b5f401fb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 12164 bytes

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