Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59f825975d40f69…

MALICIOUS

PDF

73.9 KB Created: 2021-09-22 13:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f7edbd07833bf288b91c6156543702d SHA-1: 5c16606fd1da5ee9ca25a96d83d089fb6040e982 SHA-256: b59f825975d40f69bd6ae55156286bc030b11101ed385b61c64b821b346a9c7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on potentially disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. The document body is heavily obfuscated, but the presence of external links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://studiotecnicoforace.eu/userfiles/files/44542297822.pdf In PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/65821515518.pdfIn PDF document text
    • http://519pf.com/userfiles/files/28549356685.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/verer.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210922183733.pdfIn PDF document text
    • https://areicon.com/images/file/86165273691.pdfIn PDF document text
    • https://menu2uplus.com/images/file/dofejizirera.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/cf2c4dcd4715bcfb5ee319ba4d46b26a/dinud.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/jomawejatude.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/27495138952.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/40050514215.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/54668335605.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090407534753.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/tinukupovu.pdfIn PDF document text
    • http://modern-pro.ru/files/file/tizugewujadadipewivefula.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lajanebedokudido.pdfIn PDF document text
    • http://iphysiology.ru/upload/lotetatigif.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148bc9e97455---4392281771.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/fuxelomaposurufozewirata.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/rurujigibas.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/c96aadbdb98d85d006d61cedb9a8d3e0/tazudofulurilag.pdfIn PDF document text
    • http://epicridesnepal.com/files/kumawugufaranelisuminas.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/rulitojaden.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=refusal+letter+for+job+offerPDF 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_off0000c205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC205 15748 bytes
SHA-256: 77ddf3f28200bebf578f9c063debf7cfd356da813ce9d42891759dada22e1819
font_01_sfnt_off0000e9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001020c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 10428 bytes
SHA-256: e31f088c348bea60313572c5e5ee674633db214d95ba1f126047e922de0514d3