Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6eb0c608f6b7b8…

MALICIOUS

PDF

85.9 KB Created: 2021-07-19 05:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3bee6afdf737fcf5102f3a349307af7b SHA-1: fed23453a0940b03440ba3571736810f2996cca6 SHA-256: 5c6eb0c608f6b7b88fdbf94375164e96443f8df2242a8473a4b699a390e72870
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e20c6903fbe---70310308170.pdf In PDF document text
    • http://efuegypt.org/userfiles/file/76131122343.pdfIn PDF document text
    • http://bdn10.cz/files/file/86367994229.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/a58f5c58c2209ffb2141b913ced6dd5d/71889439891.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a413422e458e5d5a9f1ca0b6407fb886/37369195996.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082c4a96bc04---26404797514.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07babec483---zizomusudanikitudagamin.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1qhh142i8c9lqg3vcarb7efjc1/vukal.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/402e0f1542984160c423e3f083aa2b61/25155795363.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/zibejedejoradofazutem.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160782ef5427e3---38968841594.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/pezutomipobadesemipeli.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/21289581517.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0d8b95539---nuwufosanatogiruvowo.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/91171863628.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e171c5cd4---9060483108.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096a09bbab63---47390407722.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080c91e2b319---wudaxipatogewuwinof.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/botovilikej.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/fixemopadutamebudujizukeg.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/92557599656.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/1a3eb1459d2b7641644a8f964904fd8e/10064888996.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/widasaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=go+this+way+and+that+crossword+cluePDF link annotation
    • 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_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 17316 bytes
SHA-256: 8309052f867356ad6fa8fe3f462f225e55e23ad6d6b0a1f9a43772034290e437
font_01_sfnt_off000118fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FE 10808 bytes
SHA-256: 2c5c64f43b461c382556479dd998796bc9345ebc91aa5021ccbf113302febcb8
font_02_sfnt_off000131ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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