Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f681d2b737e0a9…

MALICIOUS

PDF

77.1 KB Created: 2021-09-02 03:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: c139155cb63f3f848560fd69cf323025 SHA-1: cb2e8ec0eff4e7b5a6efb2e43cf8b361253a1dc3 SHA-256: 58f681d2b737e0a90dff6634cf6b549d07393fb34605838d0041b346be0d0a79
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and a link farm indicates a likely intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://asfalon.com/__files/file/zibutogumeruzugapaguku.pdf In PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/96255561713.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/c3d4ca9e9b294ba9e290ef99bee9e708/67899128827.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/fojinu.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/6eeb77e73a919a01ef8526f501e8bc3b/lumovenigadetarelitabe.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/42b477fc5424b3d8abb4d15dcc66b1d7/8144428583.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/58554176553.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/58geiqqalleu3b230vmvao2kpd/59901719963.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/b73267dc8ff2350c8ded8a4954d4d3aa/93822368367.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/xurasakejepenofigokegalup.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b4593746e---pajixubipox.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c6f098522---89726903516.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210728_AE3AA3531A6AC8D6.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/kitubu.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/24653701088.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/nevodemugobojorolefaku.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/76087651445.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/552b67e70aec9064718048f8b61b51d9/31018772306.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/6j5i4p33h8b6v4rm06ec6ob973/dixagaxogavivakavekobu.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/89918912157.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/23624226650.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/vejujusoxosipuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=signs+baby+is+tiredPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E2 10588 bytes
SHA-256: aee55b59216d22ac51adea345301d5fc8a0d9c8e3851ea5920237a3dfa638496
font_02_sfnt_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 16612 bytes
SHA-256: a25fc5b4c5f91250faf720ca059c1f939c070192fb7d7ab79a46021b8198c24e

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