Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a66ab6afcb136d…

MALICIOUS

PDF

81.7 KB Created: 2021-08-23 09:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 51a9e85e518b53f7a88aa63200b44253 SHA-1: 0bc66321d0bd4a6d88a385f269e212c543af99ef SHA-256: b3a66ab6afcb136d369e39312a0e858c0b35726715471b547fae503cbdc8fa0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=manufacturing+before+the+industrial+revolution PDF link annotation
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cf29b73e8---weneserev.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/jezukutomevuk.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/83506524757.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/57736666178.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/zuxofijifa.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/55871224977.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/68844181105.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c62fc9f97---kojetetisurevasibiloda.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/28336981352.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/soburewewaxixitefoju.pdfIn PDF document text
    • http://sjhtractor.com/d/files/kixenaxisolup.pdfIn PDF document text
    • http://swiss-ex.com/kisowadufevasasulajewif.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210606183245_t464vm.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67cef43595---dobudamozavekosivazosar.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/89747610264.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b9033c6e7---87825428946.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/71420492545.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e145c1038---12523136008.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/sibipipemuk.pdfIn PDF document text
    • http://dztechfin.com/upload/file///basijiwokuzaj.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/vasovi.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/naxakodimokusukuxefex.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/a2b618cc2d430eb09a50fd2c61e90343/xemukobe.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/nexenimom.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_off0000dde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 11056 bytes
SHA-256: 4d7b02095c29b0482b2249966d70b473748add0a587bfa339a16c7ef1ba38f59
font_01_sfnt_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7C 16436 bytes
SHA-256: 8621826b7ebc8f9b1f5e1492f2986d4ad4505e06e5845a65c3cfcd8a85e7593c

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