Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb3f4117829f39a…

MALICIOUS

PDF

98.3 KB Created: 2021-08-12 18:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8abf3245075a0f715408c67e7f45fe0f SHA-1: 5e167693e221774ae7d37d6b74a5c99abd9f1131 SHA-256: 6eb3f4117829f39aa84cbf86bbc7e5f0037e3905bdb19b5896408c8c9276be8c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely to distribute further malware or engage in SEO abuse. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=how+to+tie+stretch+magic+jewelry+cord PDF link annotation
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160854d68a9386---65395983416.pdfIn PDF document text
    • http://medrea.ru/upload/files/36530443117.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5123084b---somulu.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/66588457726.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/fumosokejofidisuvo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e339563a5---vekajixixiserobakow.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/rilolukomij.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e923e3c33---kivobudubalalerobeb.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/882846027.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/9987971980.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/bomolepibigede.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c32c183d---10501721980.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/de7d3d48689482143b7b864ac7524a96/59485342849.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee1250d5d7---dejusuwinuziz.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/gapovox.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/30452365721.pdfIn PDF document text
    • https://cecprint.com/images/file/83508837012.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/66191887073.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/2842377181.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/95817650107.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/22613616345.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f29de133776---lemapifukusikegu.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_off00011a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13222 17916 bytes
SHA-256: af122accc933f7f91f3985bbcf47661e2544e7b6c6b058f0a2daad79c0938203
font_02_sfnt_off0001607d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1607D 11032 bytes
SHA-256: 0da41e1764ff91151411f252554374e22d829c1f9d107d777ddad24674c1486a

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