Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9f2c17768d3f4b…

MALICIOUS

PDF

87.7 KB Created: 2021-09-05 13:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5c7a40f69da78355ff4bbfc5c82e6d3 SHA-1: 9ff41acb68af4dfb02700e3dae3e1bde68e03839 SHA-256: 5d9f2c17768d3f4be1d5547812c5c883b9a9477ae95f407f1802f62ea47a4c59
164 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 a link farm pointing to multiple compromised websites and disposable hosting, suggesting a phishing or malware distribution attempt. Embedded JavaScript streams are also present, which could be used to further obfuscate the malicious redirection or execute additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://matstravel.ru/userfiles/file/remebuzapimarujovabelot.pdf In PDF document text
    • http://voxel-avocats.fr/uploads/file/runuveredulibona.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/77095296367.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sosodinipakogulewizegu.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/1625511658383.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/domamu.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/13396846224.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/jedowozigabogorejuzi.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/81884714403.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81063b26f---63028753604.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/wupalopokiwexefoluberefib.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/87853500660.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/68522264112.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/42a9abafd53f22990fe48b4eaf9072a4/woduvarum.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/q0em5pof5f7u9gftujnnlc66cn/zefebelilepibe.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/42304739144.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d288b793fd4---mijikaminebetibo.pdfIn PDF document text
    • http://kammed.com/userfiles/file/4335996186.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3115e8571---kametagolokovo.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/31dgm48q4fs4bsvb2qdpij7u09/setodexidizodabidorudoxe.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/rerolevibifufir.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/32787238720.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbbcbb861e---relifatoka.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/seregatokesutitimegogu.pdfIn PDF document text
    • http://prmakeup.com/Image/files/16130974014.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c0178df51855d7472e0f0095d09024c0/zajiluzorixitilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=business+start+up+costs+template+pdfPDF 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_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 17528 bytes
SHA-256: 75c5958131ea7f47193cd00ecd106ca3eb7804efa641337a15ad001aa8e5bf90
font_01_sfnt_off00011f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001377b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377B 10936 bytes
SHA-256: de9461dc211cee4ff9a296499add589b4a1ee92a64b94938ad6bbb84de46e20b