Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93b35eb6c41d80f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 19:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f4720954916b609637db4cf45387560 SHA-1: fa08e894b9b4aeeafa9668f4566799f8c2813b5f SHA-256: e93b35eb6c41d80fcfc01512fbd09eb37db61c4b40d34d2624bc323dfa175fa9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating an attempt to host malicious content or redirect users. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification strongly suggest malicious intent, likely to deliver a phishing payload or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=tubemate+2+2+2 PDF link annotation
    • http://onsijsselstein.nl/userfiles/files/rubotodorepi.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/lebaxuwili.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/nusolape.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/dedivag.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/62201097413.pdfIn PDF document text
    • https://equalland.com/uploads/File/gotafazegogukozopev.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/6pveiq352cv32rtca42gapp0ss/28629680496.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141b6977d1d5---26643687758.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202108311916058182.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613262f1a0a2b---93457053707.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/8ordo9m76an6u35emb1hr6mmdem6ph7s/kakaninewobijom.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e32a0cb0d---ruzetuzafa.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba1bbb35b2---8173021109.pdfIn PDF document text
    • https://bnovum.hu/downloads/35218656164.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/gogoribavidipakirabi.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137b042a2609---46461068195.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba42aef266---zofal.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/fekareref.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/9619713990.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/nezekibarorolibilinubaj.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/44580891345.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/95936866709.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/migasexen.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_off0000d604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD604 17080 bytes
SHA-256: 461e77a61e85ed2561852ea17772d0597d73c39075d44d637fee9d12c7667d81
font_01_sfnt_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 9964 bytes
SHA-256: 845472d2f074508dbccbcdd11ff5d1f88fd15b09d0d0f482ed3b9c99e4e4e9c0
font_02_sfnt_off00011879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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