Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ce39917f9575dd4…

MALICIOUS

PDF

96.3 KB Created: 2021-09-04 06:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6e202c39f4d80f4eb1b79b909f682081 SHA-1: 838872b7e52769071f80cd629cc28d5bd59f9fc0 SHA-256: 0ce39917f9575dd41ca755bc3bde7dddb6e540b6a3c3c8387a189429d6bf7fdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.amedna.com/userfiles/files/watapa.pdf In PDF document text
    • https://fotojursa.cz/userfiles/file/46903538534.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/68722751772.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/rpjtku7cu5fht8rnritp5esuii/dedivuwologajir.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/pimulonobivemumelizim.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/dilateme.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6289edf19f---napemukepejariwiso.pdfIn PDF document text
    • http://atek-ent.com/upload/file/jugomiluvatalebulinu.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/vedukugimurupijudeb.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a58e1694e---wefesepizetinolelulo.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/xigoreletirawikukejafani.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/49213889737.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/70610366588.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e551b340d76---sodexibuzofifepes.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/jutemu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f781a17333f---feduzefukob.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuvaf.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/kojoxavosodoxorod.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/60554102042.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/176f69cad911fc95c7b851c755d2ffe5/81033577272.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/58606659687.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210807090630.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/78414571592.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/956ff7b7ab0bb47e81376553904e483c/59045063820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=general+principles+of+international+criminal+law+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_off00010eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFF 10908 bytes
SHA-256: 5225a6bff450ad017aaca4acea18b939a15713588284d6ae98c5f2e0ca813135
font_01_sfnt_off00012844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12844 19436 bytes
SHA-256: 1f60c8bd39b45b4d9c75f7826ad3f29886efac7084fdc7b39e69211d55a179d9
font_02_sfnt_off00015ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1