Malicious PDF — malware analysis report

Static analysis result for SHA-256 14cef8f4f73ccc1e…

MALICIOUS

PDF

86.5 KB Created: 2021-09-12 13:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 751f1176eb625b8958dd649ddeea31f4 SHA-1: cfec3f5b851b4f1cad94a8acb4bca0f69f362850 SHA-256: 14cef8f4f73ccc1e51554d7d5779248a67985613cdc4e4c843a2a6108f56278e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files, indicating a link farm designed to redirect users. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links may be hosted on compromised WordPress sites, increasing the risk of users being led to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=clear+default+apps+android PDF link annotation
    • https://indolabtek.com/Uploads/userfiles/files/90422899986.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/39508001863.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/ziboti.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/53009539231.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/44277227451.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/67166148897.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b212cc4135---muruxep.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/fafelerexos.pdfIn PDF document text
    • https://longhoang.vn/upload/files/gizaligugitopagutum.pdfIn PDF document text
    • https://ms01bet.net/contents/files/43949621392.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/65315392240.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/worevozili.pdfIn PDF document text
    • http://gibisch.info/files/files/vejidawugiwaxowoj.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/86058302673.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/polemok.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5fd60501c7d7e72a54dca0140a5f1b7c/danugixumisitovitotis.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/60634684313.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/38867544056.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/40469519812.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613615e34248e---93008228492.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/77479277714.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/31458622646.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/vibop.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/80779555129.pdfIn PDF document text
    • https://bachson.net/upload/file/32082952186.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_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 17180 bytes
SHA-256: 7e47f2fef06e3e96330c16156f986fae5c1515e8f9f5d104364f9eb8af5f49ff
font_02_sfnt_off000133ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BA 10624 bytes
SHA-256: 78b951ca76539f7f743fd22867af5e2daf1c0db96966f511e1ebda4c343239b7

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