Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c12cef86ce3f3ae…

MALICIOUS

PDF

84.3 KB Created: 2021-08-13 10:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9b23b8f6e24c643ea4c9afabb7342bb SHA-1: 8a4fc8cdbc478e3f54070d560e1eeffbd9e72092 SHA-256: 1c12cef86ce3f3ae7b9365e6bb59eb6bd0974ada584c390d0e3ca81369f6eb51
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://metabolit-plus.ru/files/file/ponepodoxamesuzozazonufi.pdf In PDF document text
    • http://foodchemsino.com/d/files/penip.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/85944437914.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/88293728330.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160770efb7fad6---zupafokafi.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b71d3a464f---70240234529.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/89608934741.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/d982878780b70fd770adac5694efbcc5/kavikigigiluzabife.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/79800614764.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/de04b0186bf69ff9dc87683eac3fc1a8/29218381894.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099d6c83fd16---21295732813.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/tavelup.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/13285269294.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/xasebezaxupularoxusebu.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/87869583989.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/purivevaxi.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/069c342211a3591d3552a1abeb4e23ce/zedanaf.pdfIn PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/84378237516.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/fikurig.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/fovunu.pdfIn PDF document text
    • http://15889163.com/ckupload/files/taleretukewidepolox.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/87240148576.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/30005823627.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/stbomb1ac88ummm1gubej9eplf/nofisukalimedizolepijuro.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f85d5f1988a---30955811406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=gizmo+photosynthesis+lab+answer+keyPDF link annotation
    • https://mediaget.com/userfiles/files/65792285012.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_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 11048 bytes
SHA-256: 5aa6e729e74ca29d7689b275f17777f78504cf57f74a6701b1526908a6293bd2
font_01_sfnt_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 17176 bytes
SHA-256: d8979b2517f2192324bb77efdea85dfd15c80adc085399a93c9c21afc2e7388f
font_02_sfnt_off00012a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1