Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b9f342b02e368a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 10:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5ae3eb1abda1eb39308c69fd0cc9611 SHA-1: d5e8b26699939156ab95ab07c65b32aa902da89f SHA-256: 80b9f342b02e368a95d33577ed156e60831fd28eb5fc4f503d93b07e0a7e0dc5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript, which is often used to redirect users to malicious websites. The document's structure and numerous external links suggest it functions as a link farm, likely intended to host phishing content or distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=gujarati+fonts+android PDF link annotation
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/a1uorc470vuvovaic2jgpmn7d5/3765634869.pdfIn PDF document text
    • http://darec.sk/files/files/bizevezidaverafok.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3cd25bd4f22ad28f2947c85a9484d16e/4247478.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614162251df05---59050885550.pdfIn PDF document text
    • http://humanlitech.com/files/files/82969197130.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/xumovutewafejojarenopimot.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/54376573678.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/84220697307.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03dab118c---zagilinumi.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/sixumorigelewomel.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/6395c34f2ecfedf42389ffa52d425f08/nuxepatadabavurogi.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/lajuguw.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613efc1d53035---nukesigefopito.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/tavoduzabemejelaxumat.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/getijolumotozedefen.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/pezomavifevagetig.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/kunonafuvuniv.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/6671889222.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/22765077062.pdfIn PDF document text
    • http://hkwwta.org/userfiles/wabofazosuzepame.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/kifavinonaboti.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109082352209391.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/34650214774.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/33240727373.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_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 19492 bytes
SHA-256: 6103c6e3db23eb184a2a4b557340b190ed1bcd397377b8ad7160aea8cad71216
font_01_sfnt_off00010ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 10440 bytes
SHA-256: e2387d5c773303f81becfbe60f98be642b145afb9b5b512c2a26159fc12842d6
font_02_sfnt_off00012283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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