Malicious PDF — malware analysis report

Static analysis result for SHA-256 5394fcfa8070298b…

MALICIOUS

PDF

97.0 KB Created: 2021-06-30 03:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 01b340de48aca7b9525d9c7431522956 SHA-1: 88794490905bda8fe64f0e8bc4f4b57215fa302d SHA-256: 5394fcfa8070298b3f46eea101f70aa4adfdd788b304f740cb817beb004ad6ce
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to deceive users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • 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://adria-ex.com/images/blog//file/74687854953.pdf In PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/877fbe7e340d641fdc2ad0caf0ac4d85/16438121706.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/k9u9hd5qnrsgur9a0pt20pngis/83595712524.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16099e52cea500---85273749982.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/1476735926.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087a5bcefdae---93167767435.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/15212982795.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/15303042684.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba060077ea9---49133915851.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/n55u2brimuatabte0njgeivi4n/pofepugefixane.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e412d2b08c2b4f3d9c2aba2953d5b523/segus.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607b358b33a18---3880610411.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/nobezisonusuwupeja.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/70924871274.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/83660218989.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/nuninefota.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/a12f65d22382b2598bbdc9d1825bc6a8/35374209014.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/28ef50a1186d78c933a1d86a460979aa/8844435797.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ece493406845924396caba3c43328df0/jimupesazosotobixibi.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/juguwiva.pdfIn PDF document text
    • http://promador.pl/userfiles/file/56102176272.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e52d250ef---69602033094.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/pawevivakigepufed.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61626466036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=good+documentation+practices+in+pharmaceutical+industryPDF 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_off00011843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13055 17536 bytes
SHA-256: e6e94d176a1787087544d2748b6bfe193dd19fb50ace951f0ca5eb78ce239e5c
font_02_sfnt_off00015ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCC 11032 bytes
SHA-256: 66a43ef25ac3464aa384c104a737a38ac6781b08c42cd2bd31ee40d3d9c4c9bf