Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba333ec8c34c1ec…

MALICIOUS

PDF

90.6 KB Created: 2021-07-27 23:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc385221d6f01592e9bbf02787d63cf8 SHA-1: defd494f80ffb9a1a54fe7e7e7f106a6f4466ba0 SHA-256: 9ba333ec8c34c1ec4745488f41e0e37c4822a1880822ab41a931239c5df520e2
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristics confirm the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://doyen.cc/images/upload/File/74616428478.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/mbtk4peenp8vrl4tovia0k5vmk/vaguvidifatojuw.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a09807a163d841f2a5e2945407765d7b/povozadomesafunuka.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c734dc7ed45---595871795.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/buwadafatubaxawiso.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/ziwojaduwisaxugazipufopiv.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/visivinajemoxidosas.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/dufizokif.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/236b3e540c076d72c78d3c16f87b9300/69080662123.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/80133819247.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/35718236772.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/getudaxovimasitixifesoj.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/lorufotoweriwakavebapora.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073eaf4af591---56116724633.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/315773b20399327703dd316711b5443c/paruvadadafasebexitem.pdfIn PDF document text
    • https://memoservicesrl.it/file/59926040955.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc4cd29cc---fenona.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f6a84928---17862169629.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc653d8459---56990129788.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609019fbdce48---26149279961.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c873dc81f4a---zitevizedaraguzu.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/fepesukidodalox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=abcd+2+movie+song+download+mp3+pagalworldPDF 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_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 17036 bytes
SHA-256: 3d8e5547764acdb836b8579b7478886f59b6c4075256dcac7346b742884fbf50
font_01_sfnt_off00012904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12904 11324 bytes
SHA-256: a6dbfe1b10f92fbd188a2e3e393b7eb1c74bb7ef4c7ae06a1840029933a140be
font_02_sfnt_off0001435a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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