Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77e447dbbaef2e3…

MALICIOUS

PDF

78.9 KB Created: 2021-09-22 22:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd75f5aff3633e8410d838abc76fd16c SHA-1: 722b49c6efa0dd283ca4164790bd0b763bc9867a SHA-256: a77e447dbbaef2e3f5b14b54765dcaaf897a7009f69c5d487ccf25df52d4a2d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. These links are designed to trick users into downloading further malicious content, likely a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=browser+for+android+that+supports+flash PDF link annotation
    • http://projecthouse.bg/uploads/CKfinder/files/36118714997.pdfIn PDF document text
    • http://ranchobg.com/img/file/64086115855.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/lotozunaxegotiluzasitijo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138daed7bc06---6336577892.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161373b912d498---13373001634.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/34577438190.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/1585811296.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/58637057875.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1c67f4d3701ae4b4e743180c776691c6/87184123404.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/46659318003.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/gugemekikofunoxari.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad8b53d89b---72355001484.pdfIn PDF document text
    • https://glozor.com/userfiles/file/zazibiz.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/78732827361.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fc8aa1413---65361151537.pdfIn PDF document text
    • https://penal-garazh.ru/files/80155491409.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/26491834846.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/46877985459.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/fafidizunazapisis.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109020049438252.pdfIn PDF document text
    • http://getem.pl/files/file/vevipik.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/zuramikifigagubepipu.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/boxuva.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_off0000cfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD0 10836 bytes
SHA-256: 1b57f19c65e8fcdb1e49817336a369114e929e1039139637b696857d9ad4a36c
font_01_sfnt_off0000e8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D2 17348 bytes
SHA-256: c4fb5f16589cd3a83c6503de6d7bd3d6da65fe07b9998e791c0b5ac4323ab3f7
font_02_sfnt_off0001158f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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