Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7f138a2ff13c9e…

MALICIOUS

PDF

84.8 KB Created: 2021-08-23 11:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 176524e168395fc934ee964cbeb1da83 SHA-1: 1a9046a29c41d8c3faf8ff82387ae50804e37318 SHA-256: 8e7f138a2ff13c9ef009a42ceec21afdcc126dd131affd50cf36b89231b0c46f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://pixomot.ru/uplcv?utm_term=winter+beer+olympics+drinking+games PDF link annotation
    • https://nguoixunghekiev.vn/userfiles/file/84526025132.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/bc637a00b38974dc312dc5724160811f/sekuwogigaxutipir.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/a6b47227dbaa89412855b91ef83668b0/19869846508.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609442d5aebd3---bugogemufida.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16080ef48182bc---74329409262.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/49275160530.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/gofalomadidaloliligo.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/35831349242.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/54849649204.pdfIn PDF document text
    • https://ikansambel.com/contents//files/29275353489.pdfIn PDF document text
    • https://songhong.info/userfiles/file/85816438354.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/v17nsbd89nrs026f2lrvguj151/nikujabupelatozipixidaf.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/6985110482.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/tikev.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/56ibaqa9tecgvglnsceve786k8/biwepeli.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160786678a9d9c---8694243277.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/masobewexogawowenokivov.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608e382a8e4f5---suvabiwukenagobamapufu.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/31218780767.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/vevomarotuxe.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/607856d2e1ee458259792d3005c6078c/8131460691.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/36067028173.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_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 11196 bytes
SHA-256: c49cee31eb0f1cbd815c5f610fcc7c178f2f4e6b20ea7f5067640751ecd833a8
font_01_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 16728 bytes
SHA-256: aa1da844fe61f9300bd8deda21005876d5576ca36d69b4dcd5ea880d3f186a9b