Malicious PDF — malware analysis report

Static analysis result for SHA-256 f774d18f2749f9f5…

MALICIOUS

PDF

88.8 KB Created: 2021-06-28 16:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23caffb6b316f7b2997c2acd3de2c166 SHA-1: bf6db466aa4df1910dd5115b526a4e0f1cb62a0f SHA-256: f774d18f2749f9f5a504009dba1a38d2d748e90b85c92c0858953b948a859663
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://smidgel.ru/uplcv?utm_term=importer+and+distributor
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a74b6c9f10c---zovobupajukinekapakab.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/7eefa8de2b864431d85e1d89309ead68/minesavipenup.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ff0027af824de5bcca1d3a9aabb69cbd/72144993981.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dvtcvjtrsev8nv2kle2pbinmvn/23015053570.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/i9vn2iaj5c7f75l6gs664n0r61/jitesegebewok.pdf
    • https://lacecinella.com/writable/public/userfiles/file/49174618964.pdf
    • http://fogathajtohirek.hu/fckfiles/file/juxujudeluxinejovilo.pdf
    • http://makesomenoise.hu/upload/file/97355530332.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606eec3528869---noboketigilevejara.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bae4e1773d8---tidozoroxod.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1jdehd8t839r5bic60epu4smcv/nuvakawe.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8962ad87bf---78884279597.pdf
    • https://anthonygillant.com/userfiles/file/nutifijenikajek.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/muucj48jj6ggeumvn3rfo8cl3a/rewizupenub.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cbc0749b7---zakusekilulutaloposiwujed.pdf
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/97119563713.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a05af98729---fedewobalamixijamavik.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160756fa12720f---lilis.pdf
    • https://soalmatematik.com/userfiles/file/14140456361.pdf
    • https://benqmusicworkshop.com/fupload/file/mijojaxamopusunifud.pdf
    • https://unserbiokorb.ch/userfiles/file/sufex.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/11508904458.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c8614ad7f---36132165370.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/lultsped5uj7i8h10nhige4l4d/58139359989.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/5483ffdf94afdc305fca17955bfdb829/sigejedelezubalipojit.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc3f8ea424---delewulenomopuruv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f817.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 16792 bytes
font_01_sfnt_off00011029.bin
24881fbec9c32e9aa6274e26d9cc7dfc89f563ee7f1b0481d16d64824939bf27
pdf-font-stream PDF embedded font (sfnt) at offset 0x11029 17460 bytes
font_02_sfnt_off00013da7.bin
864f34216e99fb57cc1225a68e504c18e383c21fb90f8b45e3bf9aa8de0260b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA7 10700 bytes