Malicious PDF — malware analysis report

Static analysis result for SHA-256 879750ad829c1ecd…

MALICIOUS

PDF

104.2 KB Created: 2021-08-07 09:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c7f53cb9e5b84889f9be5bfe0a18bba SHA-1: 7244ab745b19515128f9aad1f04798fc9ac04392 SHA-256: 879750ad829c1ecd1b530b4c40937dcbf913b4d04c2514b1ce8de4d1f2b618ea
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicate a link farm designed to redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=hint+filmi+izle+t%C3%BCrk%C3%A7e+dublaj+2020 PDF link annotation
    • http://krukaiart.com/userfiles/files/falad.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/93842561776.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e16a78906---67840414721.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/91866810460.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f081ad215e---85360941518.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/gebukujadik.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/mesosevazobuzavipobupip.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cd82b591f---pebegakave.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607056fa65c2e---27371644012.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/49815987748.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/45b5a69eec889eedd8d87f94de46b0d5/46160472386.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/61471551621.pdfIn PDF document text
    • http://vhz.cz/user-files/votolixele.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/sigejosugage.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/83306632756.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/lixulanipotetugi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af0b6160d64---43095233236.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3e6dbc26ac1ffb927d8f96ae9d8e610a/pifinotepijulososutuga.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/valixake.pdfIn PDF document text
    • http://goref.ru/files/file/miravanofaw.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/61888997582.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/lfr01kclvdn9uafv7unsc08mu6/51782490998.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_off000130b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B1 18956 bytes
SHA-256: e9d5c60727c9540a9bf6aa42baab7ad60d144fc07652c2286522022d4f92f298
font_01_sfnt_off00015ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED3 11372 bytes
SHA-256: fe3eddbb92d8fb9bcce80bb9a8faeaa19c5efa50746e0134a200c8ed9a65f0b9
font_02_sfnt_off00017943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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