Malicious PDF — malware analysis report

Static analysis result for SHA-256 035525ef41a763af…

MALICIOUS

PDF

68.6 KB Created: 2021-06-07 15:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e97886a8d7b90063abaad5fb028786b SHA-1: 26bef2bf34b0dc8f72197060db4df1b86c48bf21 SHA-256: 035525ef41a763af115823dd354c72983560d2c33841cd3417e9f8b1b0574da8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised WordPress sites hosting further malicious content, disguised as a physics question bank. The embedded URLs suggest an attempt to download and execute a second-stage payload, likely leveraging JavaScript within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inwebjor.ru/uplcv?utm_term=palme+11.s%25C4%25B1n%25C4%25B1f+fizik+soru+bankas%25C4%25B1+pdf+2018
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7929c3b709e40135e31471a9ba8c6532/lafinifakutufatufasomu.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfa82d97b5---61016484389.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072b70b494c0---puxaxopu.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee703c9554---32184854205.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dc9d6ff36---pajeli.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071af6504dd3---17071112659.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cff7051e7e---41070335260.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a79cac409a1---38489420985.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d36df6a63e---77249131387.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/5be15e6c61b3977911ed3c7d6285c139/9446745849.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/c1co67vc9gv1r048lmf1di45a0/49033209609.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/a519315e9b14e593791197998939adc7/68105709186.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a124715dddded4ae7da641fa0daa9b97/62841600392.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b32e6f7e6e0---91607489277.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc21.bin
7b3b04dcb896aacc49cdeabdb90651508fe8a0b3b94c3a78cc4da15ac31664e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC21 6024 bytes
font_01_sfnt_off0000e094.bin
5d06ad12a6afa232379e49966671543928ecab26acf7ede231e1fdaac1d85c5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 10436 bytes

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