Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38cfa96693d9f73…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 11:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 205ba6fd647f5de19eb03e5a68dbc85a SHA-1: f0efc7d7c68d3ec63702bdc5348dd0977c4269d5 SHA-256: b38cfa96693d9f7317fc1daf0c47e54214c602f80c284ffe3456d35946116c39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the malicious destination through a network of disposable and compromised hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949d3af2cbf---61732772317.pdf In PDF document text
    • http://ersatzmonitor.de/userfiles/file/63607839744.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/d490219ffcc0b9e6642155e6b9f502e9/dobame.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/robasupuvulelurogipi.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/49186458868.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/jejas9ndpg79dmqb83g89n2ib2/65172889011.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a745435d7---betiwilofef.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e50e249c32---35019986710.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/kifogepuzexixusexalixamor.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210821184954.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/jagudurofulobapumox.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085487de723d---fumifakim.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/44893848632.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83835040445.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610f70158d56a---49571510487.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160721c4184dca---gofejuza.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/zewuwadu.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/velidaruweso.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/xofiwunudumiga.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f4e30f4fc---witapufurerizudug.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/f92660cf98be3e41e75a44aad9d36bd2/fapijomivovifumi.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b4097dd1594f837e1c8024780eae45c9/romixidisawogikugazedo.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/18468931012.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/zeloneguvabujegulik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=que+es+la+demanda+agregada+pdfPDF 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_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 18932 bytes
SHA-256: 20d6427738e33ba51921ec402082142d4fad0ee487110d2c35a0ae77331d5dcb
font_01_sfnt_off00010836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 10688 bytes
SHA-256: 8a43408514e4ad89dffebf44e18730ff36c8d5dc6d40c7a44fd193055acc04dc
font_02_sfnt_off00012093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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