Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa042e285a796b0…

MALICIOUS

PDF

92.3 KB Created: 2021-06-29 08:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8522f1b5b37e07f2f06ac8e4fa786434 SHA-1: 8a2b9a2223a412c258086888acef8be7a1f6abf1 SHA-256: 9fa042e285a796b011f27f8d1f397f1a7d123b6036230b3c8a6c4eabf49e126f
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 and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URIs and link farm indicators suggest the document's primary purpose is to redirect users to compromised websites, likely for phishing or to download further malicious content. The presence of compromised CMS upload links further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://crewmak.ru/uplcv?utm_term=buck+and+wing+dance+history PDF link annotation
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/e6d860de2cf1ac97dca717b33e0bd337/21189986068.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/e0e49b228397bef26db8daad02580899/52044586795.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/futelajadukofut.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/cb7hegc1uqe6a6h7rioougs062/18084641496.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/vumetipulumowavovumakar.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073712ee74f4---kowupudokawonisixuronuxuw.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/85704322556.pdfIn PDF document text
    • http://artside.org/data/temp/file/dugunovumetuzugepari.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2176e174c42b78f7f92f290330f75055/wexilegun.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/pecii5n44fhdvqodkc9nukie1a/vewavifuri.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66caaf042e---xoxuwusodokijumopubejo.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/1svanubvt1bv5lh97r2g7lo4e6/33163263311.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/37711423302.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b2f4eaffe---66500242416.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/fumegimizawujakokubow.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/4ii5husn3hf542dasc9e1nm3dr/mowamiwelezejurugo.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/wewosodi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160881a3c38b4a---lulubikisituxaj.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3099f6fc9f33cbf54a03d16a8ccd6ebf/xamafalunalufiposexezozu.pdfIn PDF document text
    • http://usagimatur.com/files/others/genilopumisifibiti.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc4e447fb3---guwiz.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c43ac4d053---4056351091.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/bulaxulesodosutemopemefu.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/81036945944.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/8329843594.pdfIn PDF document text
    • 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_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 17344 bytes
SHA-256: 167dc801f6eb5b795fcaf3cc0a90dc950c48da87fdaab8a9005777d6c39dd646
font_01_sfnt_off000131ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A04 11048 bytes
SHA-256: 81deb6a9a84dbfeddc2c0665b6da11ee7df7e486ffc46686f0af74101144822b

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