Malicious PDF — malware analysis report

Static analysis result for SHA-256 17dd74642aa4bafa…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 13:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b22c4dfbcd6bdccc2c0b7466f6c28350 SHA-1: 8b43906d6fc9742523da144fe79902d9815c3d74 SHA-256: 17dd74642aa4bafa21c5ea3bb6ec92786cbef6ca11428b3cea57a8f525c167fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that form a link farm, many pointing to compromised websites or disposable hosting. The primary URL, 'https://medvor.ru/uplcv?utm_term=totok+apk+download+for+ios', suggests a lure for potentially unwanted applications or phishing. No scripts were extracted, but the PDF structure and embedded links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=totok+apk+download+for+ios PDF link annotation
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/pubiroginozazososugafif.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/79162993674.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/jenovimewavin.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wogejonakema.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/96504989442.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/44536092432.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/kuxaso.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/61964972218.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3d2ca544decb6f1fc6a94db935022b02/21912192552.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/27357977621.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/jexinetisuba.pdfIn PDF document text
    • https://slotpt2.com/contents/files/wowudowowevewi.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa3cbf59f---divalozerujezuw.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/83481982804.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7643ac3a0---14683036986.pdfIn PDF document text
    • http://klinok-saintp.ru/files/5967059767.pdfIn PDF document text
    • http://tortugafilms.ca/adminfiles/file/dafawifexaz.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/xumuzopebuzemosovu.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/67887438442.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/88688582731.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/42636224165.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/6907990399.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52930203263.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614362ddef4d7---dapozananejox.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_off0000d887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD887 18188 bytes
SHA-256: e9198fe2cbcf642897e0ea7754d9e7011bd539de6082e42657af3fbe40195ad7
font_01_sfnt_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F58 10500 bytes
SHA-256: 1e0d5cfb195f12c92c9e44a8979a42e29b3a66a787cd0546e11e137580783311

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