Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a60f04c303a113…

MALICIOUS

PDF

84.6 KB Created: 2021-08-26 00:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46e7ea6a7dcafe2ff5f7c7f1a9eeec4f SHA-1: cb9c38f3c7420332062c7e9e9649218f58f43be9 SHA-256: b4a60f04c303a113104270888d03df49286a89a8d6bb28d8dee5af7753f12af9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/17f048830da34ad551ee05a8a64f0dda/xozefejotesabemagexek.pdf In PDF document text
    • http://asbu.net/uploads/FCK_files/file/16859003737.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/51899179388.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/80796752442.pdfIn PDF document text
    • http://planbmedia.hu/files/3081038664.pdfIn PDF document text
    • http://apvn.info/userfiles/file/jewesewopidunekerog.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/nr6gkbss9p99v6v391lfrrumj7/72117444843.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2b068dfbf---velazozuz.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/c0f60493c814375de13b602f4d5682ba/37470733492.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/37998068630.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/eff8ad7585cd7ec5a8b375a664d07ac9/57424787323.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/0df39ojc5hl1t4bm4j40fiheub/1760046272.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/28218511600.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/80091666373.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/dakosutuvitufawagar.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945160514e8---javevuvi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b072ee2076f---21175154028.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072bab851635---rinanalibizorexime.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/razuzosobasuwegofivafo.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/95265220580.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/8737065102.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/82398269261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sample+answers+to+employee+self+evaluationPDF 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_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 16196 bytes
SHA-256: 31f4ff94145107c9abfd574a0413f8d41bc8b9837f176ec5ba9c1b9015bc5e69
font_02_sfnt_off00012a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 10960 bytes
SHA-256: 8728df0d1d50ca335aefec869f5e8a3b383d87a189d09261f8b75c1bfad657fe