Malicious PDF — malware analysis report

Static analysis result for SHA-256 646a754aac99e638…

MALICIOUS

PDF

85.5 KB Created: 2021-09-07 20:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4f616d881de7a2761d6fc015ac39f8f0 SHA-1: c247d580fc2e5434dc1e983a5256db7ca3a527ea SHA-256: 646a754aac99e63826924c378cedb7455ef9713502e3534e2b503bb4b17d7f49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://totounited.com/contents//files/98345299235.pdf In PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8840583c47---71503451866.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63fbaa2e9d---vizisejezofozuzenagofi.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/wolebozonijefux.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609871531aac6---farabirozimarexamuvatosov.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/66235193018.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/gejunafevofojisu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/04c37f56a89714d516adf88f029133a4/43718268560.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607569c0134f6---jotatijirib.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/8376512579.pdfIn PDF document text
    • http://labonscafe.com/userfiles/kaverafejefugedazepolez.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/gokadaranamakekejuna.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/i4hg17t1nqgus4u7i5fmdsnqr8/89250893524.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/31570062815.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/79527836285.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/tagewirefuvibelize.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/6dul7llo4b6qn66ep6i6umirsp/senofanemubasexitelekexe.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/6dc4234b91463bb085994d8fd1714d98/ratej.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22f13a746a---welosevaxiriga.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/26893234220.pdfIn PDF document text
    • http://emannsltd.com/userfiles/24579748920.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/jojazireloguzimopekoso.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/68868863540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=monostable+multivibrator+using+555+experiment+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_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 19668 bytes
SHA-256: 5c345f7c93ceb4b2ca6b3beddf06b782a111d509870192d2977f6256eefd9e18
font_01_sfnt_off0001153c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 11376 bytes
SHA-256: c3fe7a194ce2da4a854604caf0ed70a20ac431ae34eb844b02f7d3b2864b9921
font_02_sfnt_off00012fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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