Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b67db8a30ad1f0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 21:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b875e7618215845fdbb46ca49dc97985 SHA-1: 0dd27e4fc4eaa2a1202390c45606ced673187d6a SHA-256: f3b67db8a30ad1f01e42521de33d86f91d0755538fef3390024942211a53456c
156 Risk Score

Malware Insights

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

This PDF file was detected as a phishing trojan by ClamAV and ML classifiers. It contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute malicious content. The presence of 'utm_term' in one of the URLs suggests an attempt to track user engagement with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=5th+grade+multiplication+worksheets PDF link annotation
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3e210c0b4---luzezemi.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8fdf71b4b139dfd1d85fa8d2e21dea1b/86027790857.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/xatinedexuforolerubujo.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/fatuwimojedojepevidewuw.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/10314788124.pdfIn PDF document text
    • http://ashioke.com/images/library/File/xurofozelafumogubuke.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16fcd1b4a---56814923402.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210628061113.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/74839865198.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/bbbd539a9fe6290ccc0337c71bf47761/89941581536.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4e711c9c---35897846377.pdfIn PDF document text
    • http://orem.mn/uploads/files/wotisizerosibisufom.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/35005848253.pdfIn PDF document text
    • http://araonline.hu/uploads/file/pesuw.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ab04fc9b2501b30be313caa3ba3496ae/98052065625.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04a658fd7e---valuzuwudukaxalubogexat.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb285405fb---vopenisuxudefom.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55981bb821---66510278137.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/s7r3nugrms8ptd97gc37d2njdk/mufibavo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754c8848d29---vedeboruda.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160911e2720b00---61012798477.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0tcci61cmp84aqim89ib346uq6/rilazisiselufudinu.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_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF671 17720 bytes
SHA-256: ee3654c9b68652af182cfed7fc0b00b2c91bf7eae8ee708f07046483a944593a
font_02_sfnt_off0001247f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247F 11276 bytes
SHA-256: b94b493ade8bd1708c41fd4c6d577c1a397b746efdace86b11d1b3d2779edbe5

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