Malicious PDF — malware analysis report

Static analysis result for SHA-256 60aef3fe24d81dc9…

MALICIOUS

PDF

72.9 KB Created: 2021-09-26 06:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 014208ee3b5fa5dad80ba6e5244472bb SHA-1: 7831771e686444ad51a46946c3c9b61b807b3f52 SHA-256: 60aef3fe24d81dc96bb4340895c7b98ed256f46e5f239aa2860468a5a9e2c583
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://dobrasekacka.cz/userfiles/file/26933422936.pdf In PDF document text
    • http://matchonusa.com/uploads/files/ganudota.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e53c2b12b8---xefasufukuwusikekuvi.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/37423870260.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/dakifeginatuxelexapumidi.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/refitozojakogom.pdfIn PDF document text
    • http://gr-chem.com/upload/files/69092070803.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109201303022720.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/gurinajebaduko.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/9127161206.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/jogun.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/67142841000.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210901211002.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/kafupaduzusinegugivoziw.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/sokono.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fd4c7934a7bf55dd00aa3567d33abcea/35603224937.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/85582423253.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/65981221490.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/44a3cff0266ee0424b6739c1fcce48e3/2778679592.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/21903338166.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/pobidutarogomuzalejifoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+find+numbers+you+deleted+on+androidPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/48100002601.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_off0000b5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EC 17884 bytes
SHA-256: 10adc463cf8c7df2a76e70aaf59fb31ac6d901d5026289e20400676ed0cea309
font_01_sfnt_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 10944 bytes
SHA-256: d4727ab9bb1ed8a5c9361f84c270302a2b6639a0187a6381610743ce546e4c48
font_02_sfnt_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1