Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb86e90d89bf579…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 09:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 39719cf3859df3220dd893898b48441b SHA-1: 5a49d6222b65a4197ae2cd028a52d05cac8a9de3 SHA-256: efb86e90d89bf57901c1d1dd993e81a3e15a21f6d5b190a8182a587e82b285a8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/22moak61havv9dd8j43e3jfu52/kekurajigumorejimod.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077081ac5f98---fawumijolitajenajose.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/patanotatimijavijetawipij.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bec0fbc2a50---vilosimikebogujejeni.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/wododiwalufelufuwixogov.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/sobumesid.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s4qp8sbe2933qk3b8qtnsuake3/30413778365.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f460995e65---47106251068.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b957149e7---72642249653.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4d773984---42501805312.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fdb1b294c---wigojirib.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/16463137806.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/fekop.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/229516ca117ca20978890c65754841a4/74013629194.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/kigamapibuvenosufatalixap.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/13210823959.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/106204d24bca83391ef246787c8499fb/sutixekitolakubin.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e2f836ade---78658030463.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b66574f49---fakodabivuvutugimepewu.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/chb220pubra1kv08k9r0b41m9u/15731781589.pdfIn PDF document text
    • http://kaies.cn/upfiles/210629053402998348lzeubh.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+does+natural+mean+in+sciencePDF 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_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 10728 bytes
SHA-256: bef55e0dc1135e672a12e3315c3f9ca21fabab53d8a25e682fa29cede1e3dd9c
font_01_sfnt_off000108b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 16676 bytes
SHA-256: c613e478ac0cdb27d4c8becf8896ee1a6bb0548abfe4fe965503033b0392540e

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