Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb69bd3ba71cff7…

MALICIOUS

PDF

91.6 KB Created: 2021-06-29 01:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: abfb9eb6b252ea737db5cd69f43c7ed9 SHA-1: 54fd06bb37062ceab28e02a6931e268feb5aeef8 SHA-256: feb69bd3ba71cff7e5f9960a0be2507e9c580e0ea31bfd9d34ad02a1256b9cd5
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's primary purpose is to act as a link farm, likely to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081a0eebc562---64501185540.pdf In PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/6db42dfdaeb363538cdf2a91a29e7b19/wugolepegudifexugi.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bad796ea4fd---31316217220.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/efd9ac93eb14b6fe299aaf49856f254c/2574635448.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/74730634380.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/49e1033c39f3e8a72a9ab8de36a1ea31/80707836444.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3e70a56c5db06353c724aed63ec0942e/27743198047.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/detavakosujumivividegi.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210610_A9D1C372C756E819.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608979d567e95---82144138168.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a98c55e55b---rokavofixonok.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/45091687380.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/63576380348.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/49b45f176b775b61e1a97db1013fabdd/jewofemaguxivudu.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/reninituvi.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/95323834190.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/qvu51bqu9dp7nlkr26l6f1b5bs/lokapabogawonomigizinu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/knsr07kn8j8hqbe4v9tig4hl2o/89255519251.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66a3bc6f17---82084825858.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859ae66c760---99484598328.pdfIn PDF document text
    • https://o-dance.com/upload/files/62316080944.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/6e7d2364bc3b9f636c423e0f55822365/zulafez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=audio+visualizer+after+effects+templatePDF 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_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 19424 bytes
SHA-256: fbdf28c0c27fe3263c4a05b1696767e845db39cc5531f8817cd48cf0e6a64bab
font_01_sfnt_off00012fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE9 10884 bytes
SHA-256: 286771d8107e91d87aa93fb156b55e50e7dc17e86a61b0721054560e8741863f
font_02_sfnt_off00014935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14935 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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