Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9f29cf9e6d1497…

MALICIOUS

PDF

89.1 KB Created: 2021-08-07 00:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95a66127f0d37696f44139d43491b546 SHA-1: d118b5e533bbc4273530b5c2ac146d718f153fa1 SHA-256: 0c9f29cf9e6d1497465a3da22e449f4b8d4f21dddae47f477acdcca89e0753fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://techson-cctv.com/upload/file/16924709359.pdf In PDF document text
    • https://isleo.com/i_photos/file/78569200889.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/fd0224b1164e79c3995b677250f8d313/41197329602.pdfIn PDF document text
    • http://klhl.com/userfiles/file/kutubemidixotesonome.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c2229c52a5c2c9feabf0f266afdc7f9/deverebab.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/49904489474.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/881720c4ad3948ac6ebe4349e2478f0b/94036833401.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/tapuxoj.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607617cad6b45---pesevilodopi.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210523034247.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3e705eea---28915527992.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/97286362231.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/2533691344.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/o851aujh0cog22t5a1grjf7huf/kazidimujumupimumufeso.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/82733158970.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/53128469338.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/pugukojazobewatenozumize.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/93029212488.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4d62d2adb351c8defc239a0b944df827/xunamofu.pdfIn PDF document text
    • http://consade.com/userfiles/file/54434615903.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8407d795be---56929839267.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/12988933166.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/filifiwepavobarujikeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+prepare+capital+budgetPDF 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_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 17260 bytes
SHA-256: 361b5d2d4f570076a4eee7457f80c6ba62aaf1fa2801e91e6b39fb962bceaea3
font_01_sfnt_off00012402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12402 10732 bytes
SHA-256: a7fdce4dd8c2d323818c82f88b6d61d2a2f9f8223448193281f8fa0faddcedfd
font_02_sfnt_off00013c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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