Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf0bc337766e571…

MALICIOUS

PDF

88.6 KB Created: 2021-09-05 10:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ada7e116119a6861ecff287b9b9d2116 SHA-1: 269229557fe3685e7588ce0d3cebcac663684c58 SHA-256: bdf0bc337766e5712fdb5a169cfdb0b1ea22eb694329fdb8a34a670a86f32210
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI heuristics further supports the attack pattern of directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://medvor.ru/uplcv?utm_term=sindhudurg+district+map+in+marathi+pdf PDF link annotation
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/b037d223c5a74f4426001b2cb3b7d980/dalabezexivufazix.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/20573781263.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/zexalokefa.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/80403432243.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/fudiz.pdfIn PDF document text
    • http://sooclose.eu/upload/File/15123962665.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa19c5c67---68063890045.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/246292244.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/59550790535.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/71029512937.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/85088876961.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/cbiclg9bpff13bbvoo4ijp04bq/xarekipakovurakifatudim.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/modijizomatomizos.pdfIn PDF document text
    • https://atl-50.com/files/file/rirobaguwewafoj.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f62a07b0a13---15380422223.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/5a99017b7c2cd869b115dc3654d0dfae/57532642281.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/nqkoj65p6bhg9si70chp161aad/9053696382.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/kojarekajilogerodivo.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/tenofevuted.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/29000574f2e9718f617ef67f2b317ec5/81187927770.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/28754485548.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c9382976387a2186f9a0753791cd5ec5/kodasix.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/61936999725.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1emtc4khqtnia15rismjg2dmr6/74639353852.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/fivigidopujeruk.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021080815440570.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eb67b0b58---88365359841.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_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 10944 bytes
SHA-256: 062e55fedcc4cdba2b64bd47c4960ff990eb6a6fd6dcc2a27e9af1c658b30ba4
font_02_sfnt_off00011b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 22080 bytes
SHA-256: 6c60a89eccc5a7a512aad62c1116a69f787023af0e87a5c4bf7a9f11377f11f2

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