Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d56b1fd7b6f2c11…

MALICIOUS

PDF

92.0 KB Created: 2021-06-28 04:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c07abfdcabfa907be6d701f44310551c SHA-1: 31c2941728f0d788924ac792e9002fecc6610bba SHA-256: 3d56b1fd7b6f2c11ffba51136e95b387e6e541168654d214782518ad39afd832
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/abfccd476302f2ef90d3efe5a5624a3e/24159633528.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cd359f537---jomotuvokurekexejopaze.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bf0585ec621cffcd13ef78b79b1f8b16/1497012825.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f7klg11j6hi5ekr5vqnaq80n6/mexemebaru.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97fc688838---vodepezu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c36326bb272---26691593688.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bufodotarodudeki.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f2280f8aa---mesazifukiva.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/49045039210.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/3olbvguic3ehhviu61moms9jf5/povudamuwidasewuk.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/28031684cd5cc6db438ae7e9b2e68c2f/zujajujexib.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/e3f9a3oejn0918342lj0ro35il/zemewidijedur.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/94a695e691f1bf4b01366a2bdb29b035/51668351476.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a365c7a933d---18808584008.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/30998782505.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/62947614001.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8ad063de5---joxutebowom.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab126a76c6b---refezimotevunasafakukikuw.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/7327111484.pdfIn PDF document text
    • http://elitvorota.ru/f/file/leperusolivomonafetuxe.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/kimanekifakigetizoj.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/15581203004.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/83c63fdef03274046771162662217cad/32199795396.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2c760696---21421478028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=advanced+functions+solutionsPDF 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_off000101d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D0 18564 bytes
SHA-256: 31f059234c02ed1c2f510670a2826ec73ddfeda3e9952c72d09177ded58ac962
font_01_sfnt_off00013289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA0 10516 bytes
SHA-256: a20d4975bf77e37c4aa5b2ed6ace3b1eaf2cfd21b7edf30db62dbb87f92faaa4