Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3f09c3446e5997…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 08:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7c5b2b641a6b1b8b092f8ead4c5c9cb SHA-1: e90f4c194f3abf2a40b25f32a886d4e993726fb4 SHA-256: 1f3f09c3446e59970932d6228ef423113ba92421fcd11cae85f68060a5cececd
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, serving as a distribution mechanism for malware or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=how+to+merge+pdf+into+one+file+mac PDF link annotation
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aae4d45b1f---82253608178.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d374390504101c7596d63b008dbb5e0f/99215343598.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/degidiru.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b83abb09368f9bc18fb7cf0c01272350/jagatariwer.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/30259985659.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/lafiwuwosivol.pdfIn PDF document text
    • https://empresa-venta.hr/files/mixagunusiwaxajofejo.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/57247437911.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/24425123051.pdfIn PDF document text
    • https://drsoleimani.ir/userfiles/file/govagoxe.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/bunegokofodufone.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161299879058c4---93100441932.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093a4bb89d3f---34549905665.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160775a1c0e3d0---dazenoji.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d99c8d1faf---tufuvetewilidususav.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609eb7cd891f6---65891251862.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f1f6a3ee5---nafibi.pdfIn PDF document text
    • http://lucann.com/Upload/file/97028451204.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/wanibizafufizoruso.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/kogezivokoki.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/61203272961.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/gater.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c2bd115fbfca40a74a1af6a6153c5c65/89339305768.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/5f0b6a1016649ba9bb8e06cd0cd12061/63790744286.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/45099876418.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_off0000d3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C5 10872 bytes
SHA-256: 11005630a8381305bf3f0f2836720e72e773cc8761e371b2cd2071ef145d19c3
font_01_sfnt_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 18048 bytes
SHA-256: 0cf0b8e4f51eca86776697ddef2421ebc5c214aa950c7f73439b02b9664d7d0d
font_02_sfnt_off00011b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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