Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31f806c9196d964…

MALICIOUS

PDF

71.5 KB Created: 2021-08-27 22:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b91c0a3e4e6cdfa224fd1bcface823a3 SHA-1: 2357432fcaf6788bd6e0108d99ed583a6b608829 SHA-256: e31f806c9196d9642fc1fe9708e046a17d62c49664bdaf342d57ccbb3bf0a65b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution lure. The primary attack pattern involves directing users to these external links, likely to download further malicious payloads or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • 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://energooptima.hu/upload/File/59252032583.pdf In PDF document text
    • https://aspaeng.com/files/image/files/91215456838.pdfIn PDF document text
    • https://kueapem.com/contents//files/55555649926.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6560057c3c---70011066846.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093469e39861---rejatewaf.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/48454688194.pdfIn PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/33022311413.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17822cacbda293424b54684114af6467/25338060304.pdfIn PDF document text
    • http://bjjiffy.com/upload/wepimowosimanawukigexum.pdfIn PDF document text
    • https://emprenderem.cl/files/6992216827.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210818031743.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce0774117c---87335415858.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/sobirefukuvesuzuvodiwego.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/35143025525.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c89ee7069---jerefasefijusenexowu.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/rudam.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/17108304730.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/3943076651.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/e6bv9g6ttdt6r9ulbj6i20ffl4/93180375594.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/88912362011.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6e0f11450b6ccd3d76bbeb9a17d92b78/pofolopugoba.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/57868449489.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/tonojupux.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/vobofumejezejuneri.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/xokezoguxosuruwovo.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/10012914281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=stick+nodes+pro+free+download+androidPDF link annotation
    • http://grupo.iberia.com/js/ckfinder/userfiles/files/52410479837.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_off0000b72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72E 10868 bytes
SHA-256: d86804f8a46722e4ccd17188979b4255ea461b911f51dbab4cbb6567ea15b242
font_01_sfnt_off0000d073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD073 15696 bytes
SHA-256: 2e9ae61f591c60c3ddf7ecf5dff86d547a9ef3d84d894848a9f4f3a9a68dc0fe
font_02_sfnt_off0000f851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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