Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84abe1aa2afbf06…

MALICIOUS

PDF

97.4 KB Created: 2021-07-16 23:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f857074828b99be2126a7b09c63db032 SHA-1: 28a04afcd48d4b302bef0e38b8ef92b565e08c06 SHA-256: d84abe1aa2afbf06781559cfa23cbc990ea8291147f1b94b833b1d08a6d748d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that lead to potentially compromised WordPress upload directories or other disposable hosting. The primary purpose appears to be directing users to malicious content through a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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 http://zartmobilia.com/userfiles/file/20210521192212.pdf
    • http://alacarte-design.de/userfiles/file/82258541882.pdf
    • https://ceccarmehedinti.ro/userfiles/file/65148120303.pdf
    • http://airconbank.com/upload/fckeditor/file/9558322780.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c366e2da6bcaaec4f18d4995d3351178/22917977628.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/83684446992.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608122790d6e7---bokozigeso.pdf
    • http://bet-balance.com/userfiles/file/gokoxamogevedisenazuma.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aaf7bc86b---16401393134.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/be21a037846507a7459dca875aeb44d5/nabejor.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/0ec99d9a3448ba79f6bd0d34c12141bf/74491825225.pdf
    • http://yanarfabrics.com/firma/files/62097160675.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/nobaxedejasuzunejawiv.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c088222cab9---86520938928.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/j91hlolehutv11hioadq0h90cn/7180547898.pdf
    • https://singlespeed-switzerland.ch/userfiles/files/51159806778.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cae0443c7---selexasowozexela.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/rqjb4bg4q2rha5tkbsprdi31k6/28963226308.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c008b6feed8d040bd756b8e50a21106c/fevosigorowawimupefu.pdf
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/wezojuruvimal.pdf
    • https://poolpoint.be/uploads/file/18668575830.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/ed3f50fe3f2a8365cd8bea54d878aaff/ratedovagenununu.pdf
    • https://alusol-kw.com/ckfinder/userfiles/files/wisowobefajare.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=agronomy+jrf+notes+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_off00011762.bin
75d630d86613b53e622cb61a678d4aeb5e16ac4a9ea49c2647b12e98f2e0d47c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 17912 bytes
font_01_sfnt_off0001464f.bin
2b2bda0cad554097b5c9a5d1c3604ca54f68f0af01a5b0db42c8086c01614bcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1464F 10768 bytes
font_02_sfnt_off00015ee8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE8 16792 bytes