Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5024ad52303a25…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 17:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c6e4aa48387a0b48df9c88c10f4e3929 SHA-1: 43fc6b0be99c0ed1cc4d3abb26264934830935d3 SHA-256: da5024ad52303a2504376097e1a16a43db9fa092e0bcc57b41856a0ba38b99b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or phish for information. The presence of embedded JavaScript indicates a potential for executing malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://mtecommerce.it/public/news/file/rofuwafo.pdf In PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb183b77f1---54341466177.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/31464924553.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/90v8h0ocebcso6a6hd056053t7/90257729876.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d36138058---36674632188.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/96399178503.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/71118832078.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/lopeke.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607076242be4e---sakuti.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160786f0194824---11873390178.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/nagixajavedutifikum.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/4183787234.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94460055198.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b83d491c98---fidipanape.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1d99415644dde694011e0bd64a0bd698/99242082151.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9b3daee6cfc15188024dfdcaaccaecf8/45600582915.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/ropuzupija.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/hdejrd7kh3gl4jhnp8srilu9oi/46083248585.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/gitusubajinijuzomu.pdfIn PDF document text
    • https://slide-bearing.com/d/files/xodizenejevuxoranaza.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/ruwojuvogesaza.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5bc2a1d2d---guvejuzulid.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/tumutojen.pdfIn PDF document text
    • http://signaturecruise.com/js/ckfinder/userfiles/files/88090947490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=%D0%B2%D0%B8%D0%BA%D1%82%D0%BE%D1%80+%D1%81%D1%83%D0%B2%D0%BE%D1%80%D0%BE%D0%B2+%D0%BB%D0%B5%D0%B4%D0%BE%D0%BA%D0%BE%D0%BB+pdfPDF 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_off0000b759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB759 10760 bytes
SHA-256: 51bc743b2be967d436ef8ddf5a18f99dde4a57444c292dc7a237564a3531e9e0
font_01_sfnt_off0000cfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCF 21604 bytes
SHA-256: 09e892b8bb94143b4fc4a05c10f9177590fa29da34fd5453c4ebfe6eb97c008b
font_02_sfnt_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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