Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d89788e6fcbc891…

MALICIOUS

PDF

72.6 KB Created: 2021-08-31 21:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83a75541dbc6ee1256141549f54f4ccc SHA-1: 805347eb1af02ba22adfaf1808cf2c054f46503c SHA-256: 6d89788e6fcbc89169e7bc9e13bdd0dac42f307bcbff1d93315716dc0cc7ec4c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links for SEO manipulation or to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=time+is+perishable PDF link annotation
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612097126d469---dinogurifi.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/28726575506.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab53ec5ab9---21938223560.pdfIn PDF document text
    • http://reylab.com/userfiles/file/disololajol.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/91898451654.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c65bd076ba8---59203666229.pdfIn PDF document text
    • http://cycling-software.com/files/file/sipugexemujajifuto.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/445c9a7c8fdb5801414a206668ab8fb1/61037007409.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/puxadidixubebobazogutaku.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/60973578519.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/61322056139.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/76562146179.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3321da8711---zowudob.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c3898caaccf---42676742368.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073a0254a0f1---xuvelofapudilixoxufika.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/nexuvanexejatibabavidod.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/89613258682.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/227a534adc5b1ce5f55ccfa81af158ce/bufazerinesesanom.pdfIn PDF document text
    • https://banghenails.com/upload/file/67177893499.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/wumejigaduna.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/kixikiselopolobig.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161097a598aa62---44868986657.pdfIn PDF document text
    • https://ijp2.com/contents/files/badetirif.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/rarugikebemobarojidukod.pdfIn PDF document text
    • https://people11people.gr/uploads/File/4043030946.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_off0000bd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD31 10296 bytes
SHA-256: dfa6325a67978143a06a5ef4629e9650135d7b5f807e36d32f4b94f9d910f19f
font_01_sfnt_off0000d412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 16148 bytes
SHA-256: 22c811299651d015c45180f703f253ce0ccc76f330f72cf29f8dabeecf55d039

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