Malicious PDF — malware analysis report

Static analysis result for SHA-256 5036a5d56489ca77…

MALICIOUS

PDF

75.0 KB Created: 2021-05-21 13:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eed6d5494e4269b779c79e3fd7521057 SHA-1: 1649857cf8b128231da5ba32b740aeabb30d1630 SHA-256: 5036a5d56489ca77f3a084cb157cf59dbe74afd1f164cba54b8bc2b75f9a2705
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f539800018---45727404448.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/fe6d1fa48bdf89e0fbf22181a0c487ab/79632188121.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf0be252b---kusol.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160810ea077ac9---11974616774.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160782ad9a550f---tasinipariga.pdf
    • https://sasalidayanisma.org/uploads/file/vifarulidozul.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c1c7f647---6821436189.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5f6de86bb---molil.pdf
    • http://sequirk.ie/userfiles/file/76749963887.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076e7e6d6d1a---23799699580.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a8177741d---gilezepotimemasoxezomub.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/bd224a5a5c5a7388883c93147c293d0f/wovudejiwuwumobesixuzez.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/e7uk2u83fgf3ufeg74ibbu4ca9/dufojipiguxajajaga.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/8376fbfa42d78b58fce4dfa7662c3b90/wesowajimimadape.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=munson%2527s+fluid+mechanics+7th+solution+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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf06.bin
4d2f15e28f5af1a13533763506c31ac9e6ac998a8a7564f30cde206f388494e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF06 6428 bytes
font_01_sfnt_off0000e493.bin
9b3e884321aab52f8a22f3fa38a76c956590864e30a90caacb1b67c81f8c18cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE493 5416 bytes
font_02_sfnt_off0000f6fb.bin
1950dd34b2956e7e638fcd8a2631a0782f090ee1c91f01a0affe80fab16eef5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 10944 bytes

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