Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bd302a67768019…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 05:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a0ace620eabbf2363751ba7a9361b67 SHA-1: a1babe97f45cc89db03eb04aab2fdfd43a181d11 SHA-256: 76bd302a67768019b95b81831dedcd27f367ccbecfa7430662e0056f3a8d4dcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm designed to direct users to potentially malicious websites, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. Although no scripts were extracted, the structure and embedded URLs suggest a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54743568450.pdf In PDF document text
    • https://panificiopasticceriabattaglia.it/file/zatijagexewetojukolatovu.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/jokozimitix.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/papatel.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eda5c6861---pisoguwilo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607811b944eba---46432203695.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/nuruw.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/vepexe.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/51259495614.pdfIn PDF document text
    • https://jurad.eu/files/file/ginisikemukoparewiben.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085034d8c2b5---39932226365.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/89307801960.pdfIn PDF document text
    • http://ninfahartman.com/clients/d/d5/d5ac6782717b6a1c58177985440d8e57/File/duxumeragujipavotibigubas.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/95506135359.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/3a614622635f4df290da221301f439db/zuzataxesek.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/52f059e32e720daeefc9b457250f2257/zuzexarilunowimenobam.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7797a7764---15339210551.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/84988642687.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/049a0d5d6ceb862620595c9ab1ed2b64/54224379623.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/53222337999.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/86050556560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=kalnirnay+2019+marathi+calendar+pdf+free+downloadPDF link annotation
    • 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_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 22212 bytes
SHA-256: 2609de3af7d91a77bee17100c35476929e63c1f0b5b9d1e1866f3ddac10f3155
font_01_sfnt_off000111a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 11368 bytes
SHA-256: fffbe82aec2ccec2be2473d83d3e71b568a4e2698eb351faef297bebd1f0f7c3
font_02_sfnt_off00012c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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