Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce84afb6a94e02f1…

MALICIOUS

PDF

105.0 KB Created: 2021-09-03 01:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c1d901c063b847c8d09c7a8fd9ab328 SHA-1: bd4ec26a76e6088db3ddd8cf2fe0b25644dc56cb SHA-256: ce84afb6a94e02f1c7de45fc8b880709d37e2d4536624a17c95c3ca53cd796c2
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external links indicate an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://nensi.si/upload/file/gusobazerodikamew.pdf In PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5fd1dd4243b9f66826b1f48cbcf3d22a/63637124239.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/ferigidu.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/bonomikomuposod.pdfIn PDF document text
    • http://tele-video.ru/upload/files/54080424941.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/42478763748.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0226916907---bimilakaletaguxavamuw.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e372c366dc7---82491044244.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/955935af22eb704d09188ec7c6abc4ad/72935802480.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/bunukeditukekojuwifujog.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f522a33040---nuxos.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/74034212639.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/7d0ntv4aqh1is5icmjubmph0hn/kisevogenawawu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ba45b37200e---51480962349.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0895256df8---31266094634.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4ti50elfvjvj8gs6lvap5ivddd/soletigokobatajin.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/jovololusigominurufu.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/mitikuwitedojine.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fa5121ab5---kuxefiketowajukoper.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6169e13534---49262458815.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2b25ea1389064b33f51275cd798fa538/59498530561.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c37703a718d---kavatetinaziko.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/pejesagudutipanudikor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+hindu+newspaper+editorial+pdf+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_off0001353d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353D 10744 bytes
SHA-256: e26c6071665e2d929fb68a3773fa8e273eb718414c87011a3ec1066e4bb3c6a0
font_01_sfnt_off00014df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF2 18908 bytes
SHA-256: b6646f6b51b159de394e617e15d48b76160ed5f971986a0b3cb53b50e92cd1c8
font_02_sfnt_off00017e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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