Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f236f9596b572fd…

MALICIOUS

PDF

85.1 KB Created: 2021-06-26 01:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35bb34f1f60338bb6b38110e22f17dd8 SHA-1: 5ff1f6bd5c7491d23e0c089675030e81e1850d88 SHA-256: 9f236f9596b572fd1031080378ef2f53601254333c4ab8a47351c31b43613629
156 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external URIs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of multiple external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=silent+night+piano+numbers
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094663338824---tivolalosafepitojojisuxew.pdf
    • http://hopsch.de/uploads/file/gadikeluj.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/1g9q9bdsoo34msnal5fc7iu0pm/57414205358.pdf
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/wetaradoditikugozo.pdf
    • http://maremio.ru/admin/ckfinder/userfiles/files/vesunumabonajega.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966d6569fc3---kojomufotefowukona.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/c53fbbdc68876a990e080890b99c7449/54581550972.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fe83608aa---38062806017.pdf
    • http://exhibitionchannel.com/upload/sojedagusujumiberinuju.pdf
    • http://dakmet.pl/upload/narifomimixuj.pdf
    • https://andrejc.si/files/file/9905807267.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608045b41426a---37891620544.pdf
    • http://terralindahigh1981.com/clients/866868/File/18655153759.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb548a2fea---23429381225.pdf
    • https://amatnieks.lv/pictures/image/xelevewopabukapodikuna.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7lqj314q7c278sbd0lak4em6rv/kuxela.pdf
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/76000173783.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/0u4slqmhl8p43daa3i95r9qbhe/40702397139.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9980edba5---kelibi.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/b07fadd53f82f6dd6baa8c184cdac7f6/17411812939.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a854195ee8f---widabekomesidazufibi.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b195ecdec50---babewujoxu.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aec7ac233---wuwolasuxajovekiruso.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f7d439f3f476a9812b7af77061784ccc/fivisoginiwopu.pdf
    • 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_off0000e7fa.bin
2422de694d846f9a034ebf80dbfa0a8a2e9dab5eabf8aaa109e90885b41c134e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 11016 bytes
font_01_sfnt_off00010118.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 16792 bytes
font_02_sfnt_off0001192a.bin
d55f716b63cd18e7b5a204d332b6c8374752504c1a7b89351ff1b44a42c9886c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1192A 17032 bytes

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