Malicious PDF — malware analysis report

Static analysis result for SHA-256 2098f1022571b63c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-08 10:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 20c1a661e68f6d7e86d3fe0fffd5204a SHA-1: 452ab71914c2d55e558e4bed9a6a82d0944c57b1 SHA-256: 2098f1022571b63ca3942bc4ebaa67aca3ed8b455f670cf8fce4799874ad402b
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The primary goal seems to be redirecting users to external, potentially malicious content, aligning with a phishing or malware distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://suacuacuontoanphat.com/upload/files/fidaruzew.pdf In PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073885c444a7---30041506084.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/fotalovawosudoda.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/35634430967.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/28665124646.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/nuborujaporubiwas.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/5358968700.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/gakozesowotoxusumefekimi.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7cf2c9fe---zidawafugelegaxiputone.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/gixowidekamarakufeveg.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/9d260bfa059a64f48f1af22399177b4b/vakexixu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7a725540b59a289599e86a376d3802f3/82448223863.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/j7vt514cqi62clgrjepq4fsss3/fogegexagaba.pdfIn PDF document text
    • http://msiutilities.biz/documents/61006821951.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9eb1d55827b4df0b3aa682081aaf02a6/29964799198.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbafc2d8fc---wipexilo.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///memanojodobakevonabagoj.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c3c030e44ee1c40ab387a5502f31b873/69600258584.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a170850d73a---3342042030.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/pewofupuvikuxifatikif.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/wuzobibiki.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/dutumemidikasukujifosup.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/pebejimizenixudo.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b30e420fc2c3b10c1786180bc16803f8/kiroze.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/nivulanepafuvo.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd43150afe4---53828149955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=stoeger+str+9+manualPDF 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_off0000bf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9B 17316 bytes
SHA-256: 5368579c5cd0cf038909dda9b3840c513866ba3e9948141301d001c0980ffe8f
font_01_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 10700 bytes
SHA-256: 1de8c64f971afe1b0c875c743bb6937d1a0f300f03ef0857242af127d113f572

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