Malicious PDF — malware analysis report

Static analysis result for SHA-256 d398630440806d5f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 02:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 342161a01b066089efe541eaf28af008 SHA-1: f31bd8e4f1ac35e94a4b4adf119bd46101e19217 SHA-256: d398630440806d5fd9112bd13c3c7e493f3358e8451c18fa037d79ca289f6a00
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the structure and URL heuristics are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://vnationwide.com/userfiles/files/rolatonatudutefo.pdf In PDF document text
    • http://langeline.com/ckeditor/upload/files/duziselepetezarenuniwane.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/rufeborifowikofupedag.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090946fdc8ac---vumetenidupunafu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b377f13d89---zomuvudadupajafowuzufipi.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/10468115357.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9668746aa84ac74143bb02ca6d03f2bb/sovekor.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/37533637409.pdfIn PDF document text
    • http://navigator-33.ru/media/file/68472824133.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62387967632.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/50440418899.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/sukoximalezefawem.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/xezutitubamiditi.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/75193000027.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/repaparusot.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/48894804675.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/90a5e86e3ba94f38f877a289095ad49d/xidipusumakenajelokijitu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608769982731f---rujugawazuz.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92ad5df88---30597422912.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160769e3ad4ea5---kilokinanekekupesekamusuj.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/wubufesadososen.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/tibolug.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/tugafoxozamavulutekifo.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/54057580150.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/80081297276.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/oqk2dnjp6cbon1o86m0lojtvke/wimewofetuzazikonegebagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dukane+overhead+projector+4003+manualPDF 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_off0000cc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC80 17080 bytes
SHA-256: bf301b70729f29f2f5b2ce4014197e821de685a2ea1b519c9833ce8911fc31cd
font_01_sfnt_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 11280 bytes
SHA-256: 249aee2ea91d323cb4a279321975ca2e22aa70ddd4b4cb35d07c675b1518d50c
font_02_sfnt_off000112ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1