Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bb51b8f02d9714…

MALICIOUS

PDF

85.9 KB Created: 2021-06-27 13:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 428c54101046f79b42cd815b13fcf3b1 SHA-1: 28615e255a38f13b2e3adc6de4b68e822db46906 SHA-256: 09bb51b8f02d97144373c6f65d9e46cd2a690871ac2eb92dd4454820d94f33ea
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://infrive.ru/uplcv?utm_term=2+types+of+hypothesis PDF link annotation
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bebba4c18---67221620040.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6918d846b779d1f88d610422b852c8fc/60026662260.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759259e5c75---wukikotituvifizibuwolus.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/69606416095.pdfIn PDF document text
    • http://islandpointfl.com/userimages/91686477230.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/1g9oenbk4m4vf3g7p9qteqaua9/60228866600.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/1eehjjbklevjp5i86bbv4c332h/jexademukosaru.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/paki9ae0ahegg1u0u1u9lqn2s0/rifikifomigijilinetofozup.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/faboxefixenixus.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/41619062909.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160840a2052ed5---9319303310.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/k6p086magukjj9prss23k13gl0/33365147863.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a0ffd8975c8dc55fdc96806b51bc4e4a/22838404338.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/65861116843.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e24412f1be---gogejus.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca78d626e3---54331369884.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160914ddb3e4a3---8427635393.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vrm4e01bguc24avtfg12tqk0qi/70427479413.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/f554579183f39a6e2fbcf02ce0845531/kewirinexupofosu.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/28643868096.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/menobujeselovar.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/41203628495.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/12bea302744484393a310600b3fa7f98/fifamiziporagukegoxom.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_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 10180 bytes
SHA-256: 9152b37082cb2d709db6c383549b09a665233480cf081b3f0fb8b9a34ca33fe7
font_01_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C48 17660 bytes
SHA-256: 53a7c3c31c4655ff409ca8b80abb0fff27b4ee228a389d4942f2c7595db3082c

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