Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7686c54829e68bf…

MALICIOUS

PDF

87.3 KB Created: 2021-09-08 09:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d349b5e0b0ba6729768e8539b92d059 SHA-1: 2e134a6c1c3a2c1e468b63a5114180cb5d4f43ef SHA-256: f7686c54829e68bf175cc80ab5f9f4d9e5b604a358a3e005681432812a0235ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ab399d09843ff755aa516238ef979fa4/61374986324.pdf In PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071be2a3e9b2---netede.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/nozawesukupivoraxi.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/10336635929.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/35714997011.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/numobuzepilixi.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/26370513781.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/66147037260.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfcd8e22902---69303350004.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/gekonixivem.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612169b0d1277---25524892994.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/40106646496.pdfIn PDF document text
    • http://ned.ru/uploads/files/wuwuluvupuwepunot.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/tumagolo.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/23854519817.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/wezinemoxim.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/zofakilopulavujo.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a7155aee63be7a764d8f42eaaf6c6455/kupize.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/wilovevulivumetozeke.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffae48feaa---nuwiwiberedo.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/34848246948.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/dawejijekurukorudedavi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a651f9419a6---bevuxasop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=civil+disobedience+by+henry+david+thoreau+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f890cf04360bbde5fadd9627367daa10/34115612103.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_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 11168 bytes
SHA-256: 1a931e828eb12cc766510a1f8fdfaef0b58e277c94d5eb9c1dbafc428e722326
font_01_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 18408 bytes
SHA-256: 8bcbc75fc9d779dbbe9fca6dd5742f5a8b10720b56ae7131b4590a74b7204b92
font_02_sfnt_off00013712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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