Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b32e4acd6365a6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 10:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e01362230d8c8b99d78c63fd5b76d34 SHA-1: d1285a09c7a21f27d57b0109ab7efdc2e3e24eb7 SHA-256: d2b32e4acd6365a6e95f8eccb4d230422d558a3e3d8003b1dc739acfb94b44a9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for distributing malware or unwanted software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://medius.sk/userfiles/file/29687563429.pdf In PDF document text
    • http://ambvetesopo.eu/userfiles/files/kineletobozegusosonanuna.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/rigixoguku.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/mekepomejasutav.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/62663651167.pdfIn PDF document text
    • http://crm333.com/documentos/file/lewitenota.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/be698f8c489d333ed9046643c9e43936/67004264421.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/ponuwe.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/12431306588.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/mobewuworadapetoro.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nixegiwikukikufawek.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/9761061741.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/nojunewasotej.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/63192352542.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/xugilojuzazu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161359b07c8783---82274852234.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/musewafobobamegozo.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066b1f295a---dinomisonevorivabo.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/93597434410.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/spu5oqq6ipo2ddhctmhcjb9q47/nidukagazujotufebewax.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109081500472348.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/qn2iap62v9qkip07gr588rkba2/xiwisakisifedusasowewoduk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=tubemate+download+apk+for+androidPDF 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_off0000de5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 17652 bytes
SHA-256: 0ff2f9beea9b70eb9938ff37a42522583993c38b68c8d182a05d18fdcb0512bc
font_01_sfnt_off00010bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCA 10872 bytes
SHA-256: ea0d16795f4a27a986371118f756301b602033632b3601e574ba2b52bca31c1b
font_02_sfnt_off000124b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1