Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff7b0d618d68ba6…

MALICIOUS

PDF

83.7 KB Created: 2021-08-24 22:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffe18d0751a0a71f6d04bd6e1b1ace34 SHA-1: 47e7656d23ed3616c67a48b1527792cbf76876f3 SHA-256: aff7b0d618d68ba60605b108c622973ea79a4e6aaaa6096709524125cd0d1150
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the overall structure indicate an attempt to redirect users to external malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://irlanc.ru/uplcv?utm_term=how+to+do+double+spacing+in+pages PDF link annotation
    • http://targdenunti.ro/userfiles/file/66333231937.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/32c01c995502855ef4e3dea2dfd7e634/4571025326.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/4u4460pbd6cqk8ubgrisamprl3/50318238042.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/f6c4d9e57a904ac4270b622159401b0d/73057891806.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/kusif.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606efecf3e31c---27217081764.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/zubov.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/jepisudivoravalexebamedib.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/disewitodugipewim.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/d7fa46ed42c08fac673e05c614cf1e0b/bekurifuwexuxe.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b64f7c2713644c11b4a90f8dfd94686a/lepavejulurif.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9e437cc4---64926954304.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/xapesetewubolifarafa.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/tabazuwuf.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/cd50fa81f9e48f8be5b1e9c82682b398/45145192725.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/89112902729.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/debb8330752c89edbcc24c50245f765d/48994458901.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/7cf9fe52e779d7b31ef6d201b6371ced/53319878281.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/53950297334.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/70829668386.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/penevekabijizekafusela.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a02bf6d91c3---tobewotomiloxunejakisa.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/10240497577.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/26219221426.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/fiferavamilobefawokarawo.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/midezebevotomelokakopumet.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_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 10908 bytes
SHA-256: 51bd31d75d35a7e66e0129534aef88a6218ce8f431c1ed6cb239de2a1b3de7aa
font_02_sfnt_off0001131c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131C 17044 bytes
SHA-256: f184adf1ef1ee241cdaf3688fa07caeffa5d074e2ac38242285cf47ebaeaf2fb

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