Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c93f1ea1847ac5a…

MALICIOUS

PDF

71.5 KB Created: 2021-09-11 05:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a940ab67221e4e38e27a3d789c663435 SHA-1: 213c09b2d885f6f870c6bdf756ab00b174d2c0bd SHA-256: 9c93f1ea1847ac5a488363d7f683ecb1b1aa2d3b1db1e3384d6a7a2180a8f5b3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised or disposable hosting, indicative of a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ihde3s4j52tqrl38pg76qvpm9q/77448381649.pdf In PDF document text
    • https://parisnordmedical.fr/docs/file/98582807100.pdfIn PDF document text
    • http://tianfonmm.com/d/files/nefizoroxisezatag.pdfIn PDF document text
    • https://advik.net/userfiles/file/zojuxofumogovim.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/82768034341.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/32778944408.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/japimif.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/tepumexiwajeminep.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/nefumaxudejerozubari.pdfIn PDF document text
    • https://izometal.net/mm/file/1612552424.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/58147109491.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/pilixuxawenekidew.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/posoboxor.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137f20917b01---73645621990.pdfIn PDF document text
    • http://ausafe.net/images/art/files/71784055288.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/dofuwelorimaw.pdfIn PDF document text
    • http://artospace.com/pics/file/58651881837.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/34783995480.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/nepuwedegajojoz.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/62095141515.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zukirekotukekunomages.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/43671431200.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc57a6c82---33432545534.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/rezukadadudiv.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/31782565980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=iphone+watch+price+in+bangladeshPDF 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_off0000b63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63E 10968 bytes
SHA-256: d0a8f1478e54739cf61266a1daca0cbab59d68694bab91ffa788017e21bcd9fd
font_01_sfnt_off0000cf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3E 15828 bytes
SHA-256: a1ca773dbf3fbfc48847d3eafdd9c054ccee3a0d947f2be6fe677c1cc0dee21f
font_02_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1