Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72b2555dbf3c10b…

MALICIOUS

PDF

89.6 KB Created: 2021-07-13 12:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dbe0eab1bec2f6daab3fb4ad38191566 SHA-1: eb05407191393a8dacf934d848eac71327592d1f SHA-256: d72b2555dbf3c10b3ab1af0098dc0c0e1653c2250dcad4979297d18baf827cbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

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=compare+fraction+factors+and+products+lesson+7.5 PDF link annotation
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5dfc37de11---fopakopupadadogevarizuwe.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb855a9de9---mumewini.pdfIn PDF document text
    • https://2acontractor.it/images/file/84664433843.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/kufonub.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9637b7bf0---taxobinofewuximuk.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/sugak.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160894d71e742a---xemowaziwesepadumuz.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b91d37cc16---78105467795.pdfIn PDF document text
    • http://fittbike.hu/files/file/22179140142.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a3146c574---7364013281.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/85689121264.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5139ba647f---resoberox.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/lixudadam.pdfIn PDF document text
    • http://debden.org/userfiles/file/zegabenovodukulemalemape.pdfIn PDF document text
    • http://nenorm.com/files/files/3248525549.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/12668234991.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/6c06fab916c21f16b763170d0871ad3d/bozaz.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/91254547540.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e1bf72ffe---53886996622.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/5d389774ba3e198608597d8279bd0b6b/nemifuwerawamo.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/99820576671.pdfIn PDF document text
    • http://metall-press.ru/files/76647301818.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/85384923993.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/71523851644.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA53 17132 bytes
SHA-256: 33a5db7c3c74ea3d3536a64f7136355a4db35347935f60f383ed0c3c5835e8e9
font_01_sfnt_off000126c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C4 11160 bytes
SHA-256: 6175ce2c0d492427e97c3d6f634baeaefc2ddddaeef968916e221355e04c73e3
font_02_sfnt_off000140f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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