Malicious PDF — malware analysis report

Static analysis result for SHA-256 899759a698f40c60…

MALICIOUS

PDF

73.7 KB Created: 2021-05-06 21:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7db05ecf039c9d4c36f9782b4f4df90a SHA-1: 2f70ed02054a92a90765b17017119a5900968133 SHA-256: 899759a698f40c60bfaf6c556e2614155225700a784b7d99ef45192cac34e75a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607685e0dba48---61237173485.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742c772fa8a---kapadedivov.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073568b8c1db---sokomojab.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071993dd1959---40657025986.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfc3dad460---86573332092.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082af585ad85---xaloj.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf5e4d41d---wunolemenupanukapat.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea6b20f857---jenogetolinomajunimeveba.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2595f244a980eb83eebb0a67ec924362/riwowusobatanumukisalu.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1f933430c---55199966282.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092624cdb1b9---36405008813.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/jch9aadh7u406eeh4thj4dtpc9/31384899604.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607143e5e28c3---32859555956.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/bf29e253d6924da1ebc208cd272fd8d0/kiruvoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fractions+decimals+percents+worksheet+answers
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ca.bin
f05d6a6f69dadad60c137d3744aeededdaf0faf4c12ffec8168868d61429961e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 5212 bytes
font_01_sfnt_off0000e45c.bin
751f62afa106b893f03bc0e7e6c7896c0eea8aaff8c566d3f37edf577df44492		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 10968 bytes
font_02_sfnt_off00010992.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10992 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.