Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24cb4b1b959d139…

MALICIOUS

PDF

84.0 KB Created: 2021-06-26 23:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64f0871f9f47ebb8470f2ca4a986f027 SHA-1: d4026c1cde9aa0ceb76ce4fec6eb10d27a3fe47a SHA-256: e24cb4b1b959d139f38cdb5627b434439d519cc7e7de32e01944143f161ab952
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to trick users into downloading further malicious content. The presence of a 'download' button heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/c1344782ca75815008a764429ff1d466/36342319756.pdf
    • https://blindnow.com/userfiles/file/15974374904.pdf
    • http://okmarin.ru/userfiles/file/fogudopedalewomanul.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffe3032edc---25014887481.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/d420b198cee4567ed80cb97b215132bc/80703080561.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa56645383---fabuduwudilominodoxuze.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ss60ook9p39649gqhin3jbtbb0/85653090400.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cdebad95550---napulologofero.pdf
    • http://maasmartcity.com/userfiles/file/9580548830.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/0gmd2nsasqs62t6g6rm0udjuqf/xosisakudofebinovegok.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd58323deae---57210736044.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a3888203---75037884352.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/umeo8la5fotdlkjdmvgn4eomn7/21023773112.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/75052473513.pdf
    • https://brod-plovdiv.com/images/wogudefilapesomege.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/7r6uc3bn12upk98295nag4hv23/zejubul.pdf
    • http://scoutpate.com/userfiles/file/39675413972.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf0dc2f9b---bewuwexijagip.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd1f73026---zusurasapumas.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086c78796215---gagalenarunubuvuk.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072136728b77---63734562065.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9560c998ba---37848540238.pdf
    • http://kibbkw.com/uploads/file/48188550325.pdf
    • https://signika.pl/Upload/file/83880078329.pdf
    • http://extracam.es/app/webroot/arxius/file/xolunif.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=11th+chemistry+practical+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_off0000e6ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 16792 bytes
font_01_sfnt_off0000fee1.bin
ae65243e085eac4f253f2648aae6304a2e9b3636a11be54fb1e326760f55c58d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 10728 bytes
font_02_sfnt_off0001178c.bin
6f23bc14b0e9fb793d57631dd86018ac87a1bef41e68a5d6b9a5b1002fd7dc6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1178C 16708 bytes