Malicious PDF — malware analysis report

Static analysis result for SHA-256 f396c572996c4716…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 13:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2b77035b5be15157b6e8bc23cc92943 SHA-1: 698c9f83bee2feb91cccb4eff35591283c1673e2 SHA-256: f396c572996c4716f83faf14f1c1d6522cbc1491ba70f8b07ce2715639b1e40a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=programa+escribir+en+pdf+gratis PDF link annotation
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b529f049---72411044293.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c68294daea9---22191343368.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/36860901127.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/95a81d3ab7b64ac434b1e5cfae8033be/55122966155.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070f6c96c79e---95213896917.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891dce64560---mutizinilalijononudos.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/47084977743.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/vabijagubekuvolurezukefo.pdfIn PDF document text
    • http://isvpro.com/custom/files/namovudozodewalago.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607017ca8e63f---12847423875.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/49586873355.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1e5d0d054de148e30ed0d6a2c9da8154/58582802801.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/30533379504.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/kefixijifowabovizudinixo.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf62607608---51103648448.pdfIn PDF document text
    • https://longhoang.vn/upload/files/noguzidavivep.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079d43939ae6---92003022486.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083f7dbbfc21---vokabepejudogudomamag.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/datumagogaden.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/jamaronekalovenobope.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/11599225608.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/paloguf.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964c86bd22e---tibosijofufemubabupajujof.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_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 11060 bytes
SHA-256: 6fe0f984a6c76e14b6299cf700db85c28b47b17c71a5990cbfc32f614c6dd6c6
font_01_sfnt_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 18420 bytes
SHA-256: 88514c4db7f5a15abade00fc0b8812cc742d84ccb8179c2866bc375f427dbaa7

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