Malicious PDF — malware analysis report

Static analysis result for SHA-256 b834e6fb8c29ad3a…

MALICIOUS

PDF

90.5 KB Created: 2021-06-26 19:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55e57d44629eb6c02fd9e258c67bd9be SHA-1: c09591898a8e7e4f80a626da856d2b168c3767c3 SHA-256: b834e6fb8c29ad3a4ba254cdd2e9fb712315c318f676265864dcb3ae66034f9c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=black+dots+in+vision+that+move
    • http://amadpich.com/userfiles/file/kisufarirogoxotix.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c92977e1a0---xifarip.pdf
    • https://maconlux.lu/userfiles/files/48117364943.pdf
    • http://filtrydokoparek.pl/img/all/32873663031.pdf
    • https://pet-fashion.ro/mm/file/rapuvonokaw.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/99pmpg7bjb574mv0ls44skucd7/dotolu.pdf
    • http://agendatourvietnam.com/hinhanh/file/dimikofaravobujura.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/u1f7pctv94ksf13a3qhpo4kudb/fikagusuwu.pdf
    • http://supermarketdv.ru/files/file/35197179372.pdf
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/52685995936.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/4shbbmdmttpv1ct3j81ghriuo0/77632388276.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8b2167d9e5bbd6b4495183b8535450a2/vagutarufi.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56a89310b---xujimuf.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/25182abd7d7ea5f64d5ec7da78772344/wopikusufutoxiw.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/rjqvndh84oq46pvh1k6b4frvt1/2270268166.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/e691c20100c1abd941693c7a59567f4f/55916652849.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1da105f205---gudajabigudanujewi.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff0e27f49d---gosononezovuz.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b3037697b812cc4e1356d227e543c8b/lazuxe.pdf
    • http://aedelsur.com/contenido/files/63411792716.pdf
    • https://alshaabcoop.com/userfiles/file/gilifawetiwoxira.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075556126cf3---24626214496.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/m7g9s074f7ahbh5hjv693mkuui/94702263272.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_off0000fe52.bin
8342ccfca2478e2d690b02bf93d5d4b0dffb82fa1189f02a54d0fd339cdc6d98
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 10744 bytes
font_01_sfnt_off000116e2.bin
21441aaed1ac4d0539fee3646a90c0dbb4c7994cdd390dc49cda88e8ccb2d024
pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 17556 bytes
font_02_sfnt_off000144dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x144DD 16792 bytes