Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e76ec803fdab187…

MALICIOUS

PDF

87.7 KB Created: 2021-10-07 12:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 059bbfbcb00dd42cf40909cbf5ea1f3a SHA-1: 9a646b8097866165a52cc2feabbfb3c56a3bf4c9 SHA-256: 4e76ec803fdab18730d0d4770e82ef24250486de1c283c4adb1b1b36561235fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=knoblauch+literacy+and+the+politics+of+education PDF link annotation
    • http://arcenevents.nl/site/upload/files/lewimurekizetavituxatefir.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/xupuj.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/wuged.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/49da14c08c85b5f6b9259b414e7d2305.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/sojokobekataxutititoxexut.pdfIn PDF document text
    • http://tongweivietnam.com/ckfinder/core/connector/php/connector.php?command=QuickUpload&type=Filesupload/files/goranosimafazipirelisat.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/52288974216.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/3dccf7d6ad968bad24e089a466dd969e/kufalimalonaravosegonotaj.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/vulidemuxodidelunaniji.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuvomevasomogonodurux.pdfIn PDF document text
    • https://biodez.lt/i/File/25001153224.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/matabegupuvogeri.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/gavepubopobizis.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/xelowelanuwugetojazeka.pdfIn PDF document text
    • http://moristas.com/userfiles/files/51220628044.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/3261321575.pdfIn PDF document text
    • http://timebymtm.com/upload/files/miveso.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/gijozu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16158605fedd2c---75250774433.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/sozaj.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/70646527114.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/jeriwaxavuju.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8e2c0d2ad0747d49b1f9ba2d97baaed4/32073045404.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/29286617765.pdfIn PDF document text
    • http://timebymtm.com/upload/files/sodaradabagedisitewege.pdfIn PDF document text
    • http://componitionforum.com/issue/45/In 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_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 11064 bytes
SHA-256: 99a2e8cd6e7b1112df4922e0b4b54956dfc8f21d51e35d8da3997af4fffa71f6
font_01_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D27 19904 bytes
SHA-256: a332852e6d2ee743bdcbb65c9965dee2dac729caa8053b6c23c27410be830ceb

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