Malicious PDF — malware analysis report

Static analysis result for SHA-256 7201a8826ab33452…

MALICIOUS

PDF

128.9 KB Created: 2021-06-28 05:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f15b39eeee92e984175024e5ac9f63dc SHA-1: 85b20da6bc56100a4c2173aa1522c0426f6e7d94 SHA-256: 7201a8826ab33452b84c0f4cb9c79dd9ae6edabe3305b005bcea68458622da77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload directories, suggesting a link farm designed to host and distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's part of a larger phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea1409f28b---43273429129.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bcaa4550b---92235818068.pdfIn PDF document text
    • https://ms01bet.net/contents//files/80126423110.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e870108c331da24be607d6899bf128ca/vulitemexovamu.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210524030742130.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160962814900a4---tugatopesefil.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/3583if8j3049u1f7o7hce4j5tf/zujid.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/lukaxesawipuxe.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/bozaxamifubi.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/uu7c95hsn0dian33hvcrdcj3lp/69559672343.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///72021430533.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/6fd2381b96fddf6a76e26403d95c62df/43528170873.pdfIn PDF document text
    • http://hydrem.ru/images/file/gokobabubir.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5a7f14880465a79bef3384e2ce8869ec/xibulugewiwepovipatoke.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090f202bcd56---gijoroxagivigadu.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/igp8ps8vcujh8a23at041jhl9s/43490931683.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce065b077d---wajirexowapufom.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c7acb01d07d---22798688620.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ab98fb5629a---fepepofiwutute.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/k78evi8t5def2uqf3blqt433vh/mokuv.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/f9b4bc4f0e7a000803a2124307eb9572/wevoligolejafujod.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/numixojunitijidekes.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a728091df---19070381107.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ec488ce5b---35433835738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gate+2020+agricultural+engineering+question+paperPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000189d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189D7 18460 bytes
SHA-256: c2c13805b7da1ad5209779000d52b3a09c40959fe1c844d368eceb23726f7850
font_01_sfnt_off0001bb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D33B 1676 bytes
SHA-256: 8eb838343e23d16ccb8bcf81b8e3c588ddeefaeb9078316e0dff81191b5bd5d0
font_03_sfnt_off0001db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB33 11076 bytes
SHA-256: b26788b8b4276e5fef3e91db0dbb9f35c6b61fa76146b9d8c2475e3a5fb1017d

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