Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bfe04ccbddf27f…

MALICIOUS

PDF

93.0 KB Created: 2021-07-10 13:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 42b0922f7972bdb05fedbc5995f42db8 SHA-1: 83c2dd2240bd3f69a712e0e6bbece3c561541100 SHA-256: b3bfe04ccbddf27f52509962bf272e7f917105abbfeca43350547caa02ec2796
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/17cd872e2385bcfd3444946659a225e6/puvozubufagenami.pdf In PDF document text
    • http://griswoldremgmt.com/uploads/files/32175048880.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/88573241948.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085a5ea27f48---7186849176.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4cbkos61b41ksko02ljuobn9ju/71210515895.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/bigarelimerekove.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096eed61fe07---32038420988.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ee3ad382cfbcfd300fab6c40dfb7a0f8/73630892021.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e2b7d6c2---fevikipilaruset.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14a95b3555---kunalurobategobese.pdfIn PDF document text
    • http://www.seja.lv/assets/ckfinder/core/connector/php/uploads/files/8187698457.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6171576d6d---diditidufav.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/45991901582.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/95273329849.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa5fdcd719---31579825597.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/94ih4bmplj2oiqciuf09l7kui8/sexozegaj.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/mutopusuwiz.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/larelojedome.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/bf4f83dc6dc18f5b35ed90e65a45db19/kevewizorojujin.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4644e59f2f---xosorovulitidemulegotagaj.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/26269766220.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081e1c507685---95980219025.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/jebaxonagen.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/26e02cc6e076e8d0836a57e746c990d3/xabivajivofipoxegi.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/lasutufirejuratopanafo.pdfIn PDF document text
    • http://asfalon.com/__files/file/74916763043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=heavy+periods+with+blood+clots+treatmentPDF 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_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 11176 bytes
SHA-256: abfb06477e267196342c5ebbf180bec7034da9bbaaecb04991ed424b07f92e78
font_01_sfnt_off0001227c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8E 16852 bytes
SHA-256: 4085969cf8b328980f6d8933ac4ca8b54276b99545cc976af7c7fc0e14beb862