Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ba8d101e720729…

MALICIOUS

PDF

91.0 KB Created: 2021-07-07 12:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7b6bb2280b64f7f4f8bf3cbbee7296e SHA-1: 5f6c9eaf0793eae88b4133b764e2c0a10acc5b5d SHA-256: 68ba8d101e72072972ea3b8d4db90df46442a8d9f47e99244886f3f06a74c6a1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links to external websites, many hosted on compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=comparative+and+superlative+exercises+text PDF link annotation
    • http://sushimura1.com/uploads/files/70801618211.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b8f351674---99073934444.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///peresasemalafig.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/fenexateja.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/48b8b281257f248909e35d21e5ff50fa/fudeneb.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/bd6424a01a2cb06f00746c80cbfe0d21/wivotaxil.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/xesamibabufovugijix.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/zixaputenovoxuriniduwo.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/bukufagoxiba.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160adbaffedb66---wepatunobozuropowanozuru.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be07358389f---zokujozasubonexukobumob.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085181e1009e---24185839582.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/k4pvll56viufg80l5sh40es2kn/xakezitik.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2e87ce84ca268ed3d69c0b42eaa99142/jiripukugomes.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/bujovaxanivewakavoforaba.pdfIn PDF document text
    • http://nicosiacaffe.it/file/46753573492.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160749164c3e25---11059172701.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/55916028925.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c916a00bc3e9941c97456b3d57e8020a/62335482801.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/volakijokoki.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/9549381558.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/fokidenodewuraju.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/44ba3c58bc67070893d908db951fe271/gaziwataxetup.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/94goqrj8oeu769ujpr9bfuif11/vilosafobasozowinaz.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083752030e2f---tuzagumelumoxatubowiparo.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_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11644 10972 bytes
SHA-256: 7e223192d0885624d571bb6d3497f22fe56a86883aea6bf281b31bb1c622889f
font_02_sfnt_off00012fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC1 18364 bytes
SHA-256: 166b8970be9d26b4a6ce4d920b48010bf841a814e9076796173be7ee29bf1b39

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