Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c3d96d41a1a67a…

MALICIOUS

PDF

68.4 KB Created: 2021-09-20 21:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 847376a9ef2ebac8d853c980c9596380 SHA-1: ce7a0c52ddd7c3d249fbaa539191ffc558e25c30 SHA-256: a7c3d96d41a1a67a8b76e2a3aca67c9eb534cadeb2c16ad67e84c911d6f54f9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/32487152361.pdf In PDF document text
    • https://shevtsov-art.com/uploads/files/17345131766.pdfIn PDF document text
    • https://maturana.cl/upload/file/sewefovusado.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/nozilolojobadoriw.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/45629625064.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/riwevivodezumogo.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/24458768970.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/33483203888.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afc47e5807---walovedodimeniduwujedigox.pdfIn PDF document text
    • http://okun.su/upload/file/620055546.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/92868460944.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/wabawugujol.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/4490893311.pdfIn PDF document text
    • http://guitarenko.fr/img/files/15333528441.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/ruxogaxusajowesegu.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/42417527254.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/vanirukavukikidirazivowo.pdfIn PDF document text
    • https://tomas-music.com/contents/files/61035112399.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c965e3884---jodokonelaxajetedale.pdfIn PDF document text
    • http://contua.org/userfiles/file/85212473732.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145779ac6539---48907753539.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/61099280296.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/64116620302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gangstar+vegas+app+downloadPDF 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_off0000aed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EB 14804 bytes
SHA-256: a675642b8a65773a5cff720bd13c9d3746f17ad3f48d55fb5b3c942a357cf144
font_02_sfnt_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 10668 bytes
SHA-256: 19af14d4a58d47ea34bea6490e202b0e5c2275aa645aa57f213a37ba7bc19ede