Malicious PDF — malware analysis report

Static analysis result for SHA-256 636efb48b2c32909…

MALICIOUS

PDF

89.9 KB Created: 2021-08-02 22:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c3d37772e739d62d5a9d32a6cd748a7 SHA-1: 215cca71b712fd03229826ac3843615dcd832048 SHA-256: 636efb48b2c329096d8b44df03d57257962349e2efa777b9bf6a0bd1e91bd9ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crewmak.ru/uplcv?utm_term=how+to+know+spanner+size PDF link annotation
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/43c301362e1bf4bb28975f4aae9289f5/gegalopebososes.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/nedopopowitewukov.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3fad4d508---41867738258.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kijegugonilefoleram.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5540061affcee7938431b4b36b2e187c/21540473451.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/55630434590.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210510035614.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/xaxoburimojiduboze.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/25a4de89c91f91d46e392583696854a2/16364963088.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/d7p791desn74h0i9rc63baf6k0/62558041971.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/xejoxidelupipifeneduji.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/zezalarul.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/tezojimijizemipuwamej.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/16697343325.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb96f79758---wenidafa.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/4l6tm7rcgno56tc6gs3cetbhga/23145898274.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/jodupimu.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/48670320872.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/temopukazuwav.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cb2a41a5b3de1a16ba691cc79161361c/59748220871.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/59788e194fd65021ec2168d2300fbf25/tugipomepi.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_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 10428 bytes
SHA-256: b0e942d63722ad4866b68f603b16cf5d40efd18f02f9e3010ce8927fe2d9edf3
font_01_sfnt_off000115d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEA 16600 bytes
SHA-256: bfa64c9d3d61780c28d9a955917741d62f5e4084a40f8148ebe00390d3569447

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