Malicious PDF — malware analysis report

Static analysis result for SHA-256 7154aa86f94a6d8f…

MALICIOUS

PDF

106.9 KB Created: 2021-07-01 16:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4dbb5572ec418d3ac14653df56a7c995 SHA-1: fdb0b81dda9c661284cd474ae8d46527742aaca7 SHA-256: 7154aa86f94a6d8f05ff0c6098c2ca9fb57f015481af44a37a21c86091ce59c1
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=proverbs+questions+and+answers PDF link annotation
    • http://master-sign.ru/ckfinder/userfiles/files/43364075908.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/tumonikenilivewu.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ovgaeb4i9lgl9nksd9unpshlqe/10602987368.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/sdu09vnrcmsqqs4f1jtafv75s9/wixesemobup.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/e16d7757845da6f9c52fda71a99b21c2/22742779851.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822e2c93d51---57088505586.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f733547d31e21165bb9cb94e9b1b64bf/wopowekadilabutu.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/winuxusolawize.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a156e1ee3a3---94845228896.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080d61bc63e7---robomananolali.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdff45209d---95718379027.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/940b5e68455b7b4bfd6db3741bb969d6/87334655616.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/57501929902.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/69521081328.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e510af3555---dapojama.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/repatuvi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c2ddf0eaeb51026205662ca727e867b5/wexabufinamazemusagebud.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/3494940658.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dc3e0bf8f---goleremijepuwumoguwa.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/migiso.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/phejc6m2fc9eqmu8b4da5enqlk/fazumudawepipemamemi.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_off000142b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC9 16652 bytes
SHA-256: 4c5c627462ce8b242fe22a62bc6e7ce502e5957509ca6cc7d7abb1036d2772e1
font_02_sfnt_off00018626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18626 10732 bytes
SHA-256: acf6a1e36de9ac477772987740e6a925bc673b474e8502c1efa9ef6d57887ace

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