Malicious PDF — malware analysis report

Static analysis result for SHA-256 b733d49b538195db…

MALICIOUS

PDF

86.1 KB Created: 2021-06-29 00:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bf0fd3698bdaf36a3211d8e7f8f66286 SHA-1: e12aaa077d2a76e10ef887053ec6decbf374ae4d SHA-256: b733d49b538195db0c94a404bf584db54f412e04270a5da23a972290fa515931
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or malware downloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are spread across many disposable hosts, a common tactic for evading detection. No scripts were extracted from this sample, but the presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=mike+boyle+strength PDF link annotation
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f2cd8444---tekijuwuzuxez.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/74586365239.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/21eddcp0qu9vvruu7b8l5uvbdq/19522154233.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/dizidutunuzum.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/6164786822.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5cece00e0---73983536630.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084b5bd4db71---susedudadumimubawelebexi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712f583627a---1900478725.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/qosoba4v9g8vc6l5ri68mv3f4h/bixusisamixasad.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/ee49e5b7b7766417998549ecdf7d09dd/2105901522.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/1n5mrgrjjgdjs49oe5sdgvs8p7/lupigafedonirozuvawolibuf.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/nobikavawosifuzexawafopom.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/xizibugona.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/abe117a91e901183e1e55b3095146264/bivojufelozobiledir.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/21760049489.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/94045058278.pdfIn PDF document text
    • https://tavio.ru/files/file/durikukemowenakefefox.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/98671608977.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f67ca22bc---pironomasag.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/30402424196.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/8532269373.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/k82r5k8goq0tlkccm3783e6nd2/67343119034.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/39830447139.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/91026969284.pdfIn PDF document text
    • 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_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 19648 bytes
SHA-256: 627cb07f24d29f8db193da46814c8bbc3ed0a663f4a8867720b70ec507496f9e
font_01_sfnt_off00011b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 10564 bytes
SHA-256: 6ccc832dd2269468dd9142a6e3dc6655c621342433de17f2e85bbd3e687747f2
font_02_sfnt_off00013367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1