Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7c70f8396c9560…

MALICIOUS

PDF

93.4 KB Created: 2021-07-05 18:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd66563d0d56e8798f69bdd0b0090d78 SHA-1: 774a04452523ac67370701ebd4247de6b7d07c9c SHA-256: bd7c70f8396c9560c50da31f3995b3d3293fca7eda7ff411f6584aeda488521e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c49df3f4d94f369699e0c2f76aa288ec/kiros.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5696ccfc17d03c9c32498327f6737fc6/23374898363.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/cbd98c62508baed448703145cc554ccd/bekidijevobaf.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/9v8mj28i3sf6prpjqg2hug7sth/vozezuv.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3999af9b8b32a4068aa09daa2a29326c/neripojanuk.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef2aab64a0---gokalop.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a27fc65b483---tumibikonunaled.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ec010267399bc284540a5dfb556292e8/58116923751.pdf
    • http://mulroyenvironmental.ie/userfiles/file/58607451038.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c58e42082---94131223079.pdf
    • http://didaconcept.com/admin/fckeditor/file/21716715551.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/sanokufukavisemoxitoka.pdf
    • https://accuratesearch.com/userfiles/file/kupokisupepotutefis.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/69f8e7ab605d23b5599103d2390b2ff4/37650467656.pdf
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/kogosinevigok.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d97f2ec76---tolir.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/343oge2cpqlpjek8bg6f0ds360/37153812027.pdf
    • http://matstravel.ru/userfiles/file/zizipeseb.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/23btu9f344sek8lbhl9f946429/pabibagemoxekedefagi.pdf
    • http://www.anclupnapoli.it/userfiles/file/tuxozigovuka.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7f10c722---42277065897.pdf
    • http://antoniolescio.net/userfiles/files/kilinojabizemedilujonowa.pdf
    • https://alice-immo.com/userfiles/file/tikafetobekevope.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c2f7be740fba86dda2c6276fd163418c/darotunuzib.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd0e01db8f---52665321131.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+boars+head+bishops+castle
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f451.bin
69f000ab8307564a685dc667911bbde8b7d53840394dd83f20fada7a9092f847
pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 17124 bytes
font_01_sfnt_off000120af.bin
6b54a3f50d1a413a5c8c0ed289a9c866e37e8bd73df0b162fe7132700ce54c18
pdf-font-stream PDF embedded font (sfnt) at offset 0x120AF 16100 bytes
font_02_sfnt_off000135f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135F1 16792 bytes
font_03_sfnt_off00014e08.bin
542ff60a98d97831caea1c84ab663a9bc6e377eca99f83ed317640a96ab9837b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E08 10612 bytes