Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6df73e525eab63…

MALICIOUS

PDF

68.3 KB Created: 2021-10-01 20:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d5179b3efd810d9f33ea24ea462a6d04 SHA-1: 9a210635c9c72687cb08e0da13b7525c44a955d3 SHA-256: 5f6df73e525eab63a752a752ff38144ecee9f5745ab0f17b529a87242faab484
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The file's structure and link distribution suggest it's designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614495c144135---56919546345.pdf In PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/dc9ba481adbe4965614e3aeb207e6418/lasuzetejatetal.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/dalotuvixewi.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/77866950093.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/78980776831.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/wukufepejito.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4c199abb43531d8c216b78afc134191b/dolumukizer.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/jevukig.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/94604272476.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/wotogebobumotivuj.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/84823891961.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/wizezumexuma.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/67921180789.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/wufekowadiporogudabor.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/78635239408.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/takisexir.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/8050708004.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/68026437993.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109090828566704.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/lamoj.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/87422692857.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/24718398986.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/wifatasumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=where+can+i+watch+superbadPDF 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_off0000aed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED1 10764 bytes
SHA-256: c8ad03692cad44114cefb905e38d908f81bfdae283761ac4e71c7441e71f828f
font_01_sfnt_off0000c75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75A 14608 bytes
SHA-256: 83238258b00d93a1fcd8688554cbfd9685233267613434880b499ed48e56a4e9
font_02_sfnt_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1