Malicious PDF — malware analysis report

Static analysis result for SHA-256 31af099896c66d6f…

MALICIOUS

PDF

77.2 KB Created: 2021-05-20 01:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 047e1dbadee4a70dae6d220cb0859275 SHA-1: 478a7187968962218c57b4bf3bd02e35613b84fb SHA-256: 31af099896c66d6f40e9893b423baac875960a78aa03ffa20d1333d0fde2e47e
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised websites, likely intended to host or redirect to malicious content. The presence of a link with 'minecraft free download apk' in the URL, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/uplcv?utm_term=minecraft+free+download+apk+0.13.0
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/8d7ef5010c005968d86b1d97b741d0be/57124468115.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070be03990b2---belujizejetesu.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4728ec7e7---dezexewo.pdf
    • http://naturallabs.fr/userfiles/file/67179703655.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/2rh80avb05d8b1d86fplf8a70m/5288170622.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6b854c5385332c20f261fee6c6b694fc/posoda.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e276d9786bac2cd0b1d3efed20cd998f/luwirujizorosanadavone.pdf
    • http://sacoorhealth.pt/site/upload/file/jubarogumu.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e511a2a5---217222610.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a099163a134---filazimijuxatiberazub.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160942c3134253---26160590851.pdf
    • https://xlspandoek.nl/userfiles/file/65714902408.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a8cace2d8---vatakosemiwowajijo.pdf
    • http://ash-graphy.com/userfiles/file/lasijovovesixoxuposegefit.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c640ce773f---7310920742.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/4334ae190fadd1ffa81c75fe29316f3e/95124047397.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/pakutibidepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76d.bin
6bb3d7c5076adade769432ffcff5a2b8b3167f3e8353b6326053979694309f35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 5308 bytes
font_01_sfnt_off0000f99f.bin
9480115a75bcae44c5ad0d4fb0bcf8bd4249f1c494e3dc181c0503a49f3167f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 10164 bytes
font_02_sfnt_off00011c4d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4D 4324 bytes

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