Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c719b5d040c66bb…

MALICIOUS

PDF

71.1 KB Created: 2021-09-20 13:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da3a3dc19b0849261eb94616ae4aa8f6 SHA-1: ea50d386b506fa9edab6e7e7c4c989933f7f82d0 SHA-256: 8c719b5d040c66bb6ca7c8e8384ad51b8e4149c054180824ef682703165ee16f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f9e1292c2---malizijaseromoginu.pdf In PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/mujofepep.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132295bce293---jazobivekowolobabexorow.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/51725627770.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/niwotakexetapidak.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/venoxemonajepuf.pdfIn PDF document text
    • https://csn-alliance.com/data/files/55021171766.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/gituf.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/dedafelavubafejoxaso.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/358071186.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161485bf52133a---lugeratijep.pdfIn PDF document text
    • http://nemalipics.com/93130043768.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/32245495653.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/46445053663.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/zegivojarovegokuxe.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210917_0712ABC94F8E559F.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/95416306679.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/2ddaf69e063f98c742e762fb60f4bf0d/dixasuwuduf.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/bc1a86268ee1057554f878dddb77b1ee/65268520932.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/51957384137.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/56107308961.pdfIn PDF document text
    • http://oris-am.com/editor_up/butukexetokuruzo.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/87560091968.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/90713406655.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/topavolulif.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471e473b431---25721447264.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/91424254503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=highway+rider+mod+apk+downloadPDF 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_off0000b7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B5 15132 bytes
SHA-256: f74710acb3647be0f36f45dee27553e282b2c89cfc184e60ba3bfb9629492d07
font_01_sfnt_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 10856 bytes
SHA-256: ef3434c2b696963634454b130ef60d49f1d287995806173efbb438db0dc7b77c
font_02_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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