Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b21fd42bdd266d…

MALICIOUS

PDF

84.5 KB Created: 2021-07-20 15:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a888ddb91e10bfc0da6a0dc0cb06c130 SHA-1: a5bec49d6e1e90f5c1747711a47a0c6e2a434f9e SHA-256: 32b21fd42bdd266dee1533a9f168524c32f6eec14b208cc7fa2ab0053f1dbe50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or use link farm techniques to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://trotusgrup.ro/ckfinder/userfiles/files/24534236584.pdf In PDF document text
    • http://bassbasement.org/userfiles/file/pegef.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/rabumik.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/rufenesulapigefakebubixul.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/zavuluminapelisawomubi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a10fd823b---78969665316.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160762a06a8902---8882783062.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/tabomvv8cugauono1gdi6knav1/bubiponixaguxonofe.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/wamiwevavifilutokobebina.pdfIn PDF document text
    • https://grandegroup.net/files/wunivezotosumorufov.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/76129365142.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/0bfa57c5612b4d80dc63925fde7abe54/vupim.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jgj1f04d6m5i81529dq37sv360/gotuwapeduseg.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/99676996220.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23fa5caacc---sujanavovogupojojokojosab.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ae341776---lafifamavamesurinulilo.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/29678852037.pdfIn PDF document text
    • https://icfas.net/icfas_new/dev/ckfinder/userfiles/files/2885547570.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/29034060038.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/59860897577.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a09cece4---10525333796.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f2395583---xidoxaged.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b378b6f8---20448051004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cts+v+coupe+manual+for+salePDF 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_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 10744 bytes
SHA-256: 11abc58786fb3a02bfe9bbfcb6032f6399c5e7eda1dc62d1cbc62ac3af054d82
font_01_sfnt_off0000fde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE1 18024 bytes
SHA-256: 12a99c7fb8272f472b3975197f41c7d394da5916c620ec1482c571fa2e7877d8
font_02_sfnt_off00012cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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