Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac14ce9607dadb7…

MALICIOUS

PDF

85.7 KB Created: 2021-09-20 09:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a612ea9407ad776349fb75733241a85a SHA-1: 1d2fef52f2c951bfde15a1dab2a1056e07b8368f SHA-256: 3ac14ce9607dadb7192d1eb71d7be55559dd82450919c26331836b058b0876f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware delivery lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://digivideos.net/ckfinder/userfiles/files/wopudasonojegudofo.pdf
    • http://dtjxbpzx.com/filespath/files/20210901203612.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6b9602120---2568031187.pdf
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/72483262263.pdf
    • http://palakkadtourism.in/ckfinder/userfiles/files/fexebogugijevopazere.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/h9816l093lnqm0r661aecap963/revezesakikev.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f45ec416f5---zedufemoxekajejotejoxago.pdf
    • https://bisleri.genefied.co/ckfinder/userfiles/files/95758563878.pdf
    • http://bluestandard.pl/ckfinder/userfiles/files/53206479782.pdf
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17278421703.pdf
    • https://topinsolventa.ro/userfiles/file/93381290644.pdf
    • http://think6.net/ckfinder/userfiles/files/20210909100350.pdf
    • http://hmed.vn/upload/files/5755339870.pdf
    • http://mertcelikkapi.com/userfiles/file/76599707651.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/b2gabdu5u8bf4ugpaiekoijm2l/liboluxewubuzu.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/13469403611.pdf
    • http://luchetti.it/userfiles/files/16655948760.pdf
    • http://apartmany.cucoriedka.sk/data/files/puzarajukuj.pdf
    • http://turbotechnik24.de/userfiles/file/92802257194.pdf
    • http://www.schule.havonix.com/ckfinder/userfiles/files/1934980569.pdf
    • http://prasongp.com/file_media/file_image/file/pifopadiludonopisuropi.pdf
    • http://formpart.com/upload/ckfinder/files/71536663744.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/649539be5ad7b7f890ccaf95c5a1db38/67052004775.pdf
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/81059442478.pdf
    • http://maschimaurizio.it/userfiles/files/ziwafaz.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/10245661430.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bijoy+keyboard+apk+old+version
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc2.bin
689d3928bfb47fb9118a92a8e998c88c692212c26c0eadb5204a348d1c8c5a88
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 10884 bytes
font_01_sfnt_off0000f8c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 16792 bytes
font_02_sfnt_off000110d9.bin
b6a6f28846baab743845a2137446bf88189e8b8d50672c9262d48285bea13353
pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 20812 bytes