Malicious PDF — malware analysis report

Static analysis result for SHA-256 2142fe65c7ff646a…

MALICIOUS

PDF

88.0 KB Created: 2021-07-22 15:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 93df36a1826db4ac5579e8943f387c63 SHA-1: 7b42b38feb58b0ed6d6173e9491172a4c2cb0385 SHA-256: 2142fe65c7ff646a24a0fa8cf4c5af596f59127f15c7d4bbedf063400f2684d9
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://xanbiente.de/userfiles/file/81787777466.pdf In PDF document text
    • http://geredekombiservisi.com/userfiles/file/mowebixuvojogolizekosi.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1626220658.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b482c72fd5c---3656056521.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1afebe645200da2d0329428533cba100/75352830415.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/44790362542.pdfIn PDF document text
    • http://midel.me/userfiles/file/66911230603.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/93111436248.pdfIn PDF document text
    • http://join-angel.com/ckfinder/userfiles/files/telesetusowixavekomuxi.pdfIn PDF document text
    • http://medica-brno.com/files/5445320264.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/fapizujujirenudenudeta.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b5c13135374---jitugikadubo.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/nenobit.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081f689a928a---jirunelubepumodugobajir.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a8e385bd---57489359824.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae123dbbfe---gawejilov.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/92795540275.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/manedomukulumotum.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/gadenikuwumiwatepus.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/73068293806.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/patomixani.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/21052615080446920265ghas.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd87e1c9b---nubezol.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=apk+porn+games+androidPDF 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_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 16476 bytes
SHA-256: 812fe14b7626b4b34816bc7960cd971d725374d20cef98723400fe287bee129c
font_01_sfnt_off0001212c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13943 10664 bytes
SHA-256: 7f0e53a384308d702a2e09806ae59e700f65f864bd9b61de7ca7ecdc812f3920