Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7de4c25cb9d5275…

MALICIOUS

PDF

173.4 KB Created: 2021-07-04 22:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48d71c4e72adb751134de6253926ea95 SHA-1: b7142df85e88333bc4930cd813e309d011930d5c SHA-256: d7de4c25cb9d5275db890462828ead4248fe8cf43f6f0a0f52ae0c3ef282148c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document leverages a link farm hosted on compromised WordPress sites, likely to redirect users to a malicious payload. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://yournew.site/wp-content/plugins/super-forms/uploads/php/files/geimkvg4cc0vdvdmvbmuproikc/nolesomivizagusite.pdf In PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/37f00c43ceeaf69f3c69d0ad512b67c6/74074379395.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/cecc54cb3c7415be3ef065ab4cc075a4/zezute.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/19821207622.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ed3545660cdc155c7f76e22fd81cdc9e/16388868178.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160773a293e377---58125637514.pdfIn PDF document text
    • http://kodemari.info/data/files/2539113262.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e65387ace633e5ec83f1fa805a22ff29/41158540859.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/57c402e90a23c655fd375bd9199483dc/bakavosexosodulerajeli.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c63f2f10f---83794724585.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/171814b430d43f81e07f7bcfd223ccb1/paranolezivaxepoja.pdfIn PDF document text
    • http://jarosi.hu/files/file/xajopewapamikidov.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609834133bee9---gugiragetidasid.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/sipogazalolafilazi.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a001c7ae4e5---palebelamujikef.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/011b7f8dea68f777a1b99f5fdc8a4ce3/85488866831.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be744dc834f---30935206426.pdfIn PDF document text
    • http://fitviewer.de/files/file/kirunutesenazidaredodaju.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/23066892404.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/tet20t3aqs3r4s8cam6e0tti15/44493034950.pdfIn PDF document text
    • https://krossi.ru/images/content/files/79930530388.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/73751546082.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2367bacea78fe9090f251dec0495fca1/dufizotigofovevidume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+often+meaning+in+malayalamPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000237a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x237A7 10480 bytes
SHA-256: 046143ca290e796aeeea19fba23459909f73bd738ca442d6a90576edd8f94d71
font_01_sfnt_off00024f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24F7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002678e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2678E 26324 bytes
SHA-256: daedfba22ae5e00e1b496b3556669f9b74201818149ab6d23ad0960e0f9c3778