Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b1abc0347c2e78…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 17:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a5ecba37c78a2194e5cbfd94d0d6b4db SHA-1: 24c4be7c60be777574bf17b1d9010139c16e4e75 SHA-256: b9b1abc0347c2e784fa634a183709a499187c2a73823b6ce4268c4312af387eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content, consistent with phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=all+characters+from+sword+art+online PDF link annotation
    • https://konteshamamotu.com/userfiles/file/46031257731.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/xirowawuzetawekumisulu.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/bilamemub.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/31986290240.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/42323502327.pdfIn PDF document text
    • https://premiersuli.hu/files/files/48800114341.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/tagivefudaraze.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/bosugaxigozumefudasaw.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/pobotifurajerokebuku.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf5d5be94---33392886000.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/lagevobirekodujiw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614547db19fa2---40520168050.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/72145712313.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/wetuvosuxolaf.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/20376457025.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16144ab341823c---josefatovewavitimopel.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/18610951444.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/20221485857.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/vilobufoxugusesamapowogel.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/13806108089.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/xekebudasesofolixemajowi.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/luwiwu.pdfIn PDF document text
    • 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_off0000d520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 17516 bytes
SHA-256: ec5f9d1aed55d702cd6c981f1843f73fe599bac66e75b753fce85d4daa158bd2
font_02_sfnt_off00011b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1D 10808 bytes
SHA-256: f91cafb7c53d2607a605a388631c6214cf44710b5916e88047e9e686746cb1ea