Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21264cff772e9b2…

MALICIOUS

PDF

87.8 KB Created: 2021-07-04 01:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 98ad65df60ce0191bfd275f101736eb4 SHA-1: d2671df4143c4e48fa1f67702835c5256031aabd SHA-256: a21264cff772e9b2126935a2a02542399de61b7263259f58a9c4d8b2117618a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ML classifiers and ClamAV, and contains numerous links pointing to compromised WordPress sites. These links are likely part of a link farm designed to host malicious content or redirect users to phishing sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cf40dc5b3ed---36466981884.pdf In PDF document text
    • http://arenabilardo.com/data/_files/93351094779.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/fb58ec31822d5a0f4a3da91ffebf828b/80348912779.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f157ebc752---lifajaxa.pdfIn PDF document text
    • https://akbaturgame.com/calisma2/files/uploads/dajupe.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/2420195629.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/93305694608.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8e7589f124627ed5f3ab8b5dd415aed4/50136345996.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609473645c1b9---woperubabubejotunumazup.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2ecc9aeaa74821f776cbb816825b6846/bumuwaxizazaja.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/pevugorapaxisalalotez.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/19430785513.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/fajanubejewexetedomeju.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/n80mdljfi5lfep6jtpljl7ctr1/zubizakikulinam.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4be35a737af389a075ee2b74ed787fdc/99237097723.pdfIn PDF document text
    • http://camonetinternational.com/files/file/91740602127.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/zaneb.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/4b92f98c365f22cf2d89168ebe3cf462/66478567267.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160712f7ee2d59---togaloxefezorexozom.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19285aa0b1---30704714364.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4c32dd4f20ebeea899056658e236e301/pijarasikedegezaxofog.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf5ecaac8---rogozigulomitununavuso.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d879f31a1f---11045289300.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2692f8efc014f7882c754ed5a5748fb6/563946078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=common+multiples+of+3+and+8+less+than+50PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 16704 bytes
SHA-256: 9b05da3faef6d6a2c3da5a7aa7a7b3be5b86dc98d551522643d959aa18df25ef
font_01_sfnt_off00011efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 11428 bytes
SHA-256: da1c79423fb0aade30758ac19d6b529fe08527e790b7ce7dacac5607e305df8f
font_02_sfnt_off000139cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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