Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b962de9753e3736…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 21:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5c02c0668e25d7eac0c448b71077c64b SHA-1: 11ba120cd62cf20836741f6069110e9848742269 SHA-256: 4b962de9753e3736558da17bedb8b39b9d5363c6ef7af518e28f80201c781ec0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5184f545---vunisibagites.pdf In PDF document text
    • http://ropesadventure.com/d/files/74641601189.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607d52a942430---73922346478.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/3app46l3be8hdddhrtud7isscv/wenodenelabutoj.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/fb464415faa155c58fb2179f383c9ee5/tagaxibepilononotokuji.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/49687674602.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/gisaweziranosivotoluxafi.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/zolomubimalanedozegazeg.pdfIn PDF document text
    • http://vhktn.at/images/content/files/novuxexeto.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/miminil.pdfIn PDF document text
    • http://greenbrier101.com/userimages/52509001051.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076321d14353---tivevexipadosimus.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210621015144_1ucn4o.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/somikimowa.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/korerunisigadi.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837e57bb3e2---33033500333.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/214a898ca71728d5e38b6b0ef5e24a89/90400665202.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jqvevc0fm9iqo2fobkrhal2123/rokufexozanulajifilu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/j350sgv6l117p2u2218uetmlgf/jededuf.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/60376065975.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/8t8ta9mhvc620kk00md9k9ab3p/35588098142.pdfIn PDF document text
    • http://findusafranchise.com/files/files/numoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=graphical+user+interface+notes+pdfPDF 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_off0000d987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 10856 bytes
SHA-256: 1e86df6f26c5ace7ba0a530e71cc6b3531807a6769440960aec949b716b90c9d
font_02_sfnt_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 17196 bytes
SHA-256: 8d1a774768f17dc7155be16a38ecca21a11aa0dec880683926ce4453844fd234

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