Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac95d6e6c677707…

MALICIOUS

PDF

76.4 KB Created: 2021-09-07 21:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fc03c326c6889f273516d92b818a4252 SHA-1: 06bd4a8926db9d9587bbfe28679709970107edb5 SHA-256: cac95d6e6c67770777f9873ab154dc6890b21ec91ef1ea0e2908e932c5f3995f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, many of which are WordPress installations hosting files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the heuristic firings and URL analysis point to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079ac599432c---femejexitune.pdf In PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14b022a55f---10448361389.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7c9718af---2154043029.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/18286786251.pdfIn PDF document text
    • http://marketingnews.fr/images/file/girogafixex.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/4e195b1266bf3f1a846a79d8aad509e8/85018225696.pdfIn PDF document text
    • http://slsnn.ru/content/file/welaxuku.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe2934f975---45448574700.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/vogek.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee74364659---vavopaduxutofabazumub.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a6013ae3b8ceb02f3ca0df317a78fc49/xetaz.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/29616872996.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/3817751200.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/lujokopovafi.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/54494747900.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/rozuf.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16094122fe22a9---mujado.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/24968585072.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/9on6kq0sc2qbki3p0cb69ovfk3/wesonov.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/58614743322.pdfIn PDF document text
    • http://philboyd.com/degumapaxagusaliriroroxed.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/texanevafadupotoxax.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4369b5678cfeef16577f5faa30c21495/17159139553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=nosso+lar+pdf+livroPDF 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_off0000c25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25E 10200 bytes
SHA-256: a9f389db1e1430d5184fe0d4d47774d3b88fe510c2e9d6cbaf22911e2e0548c4
font_01_sfnt_off0000d94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 19472 bytes
SHA-256: c9254f514237c12e18f70cd8cabb08dc0feb62cdf11636a2821a27b7faed9e68