Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e1eb81d9e5733f…

MALICIOUS

PDF

103.1 KB Created: 2021-08-14 05:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: be484b0027573f0168526cb120c128df SHA-1: 186059e218e12f0d70b1b77f2ed9434bdd80362d SHA-256: 22e1eb81d9e5733f2a43e45921e7b0fc4fd173c11017a33c553a24c73e11d5d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, but the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://kino-cosmik.ru/sadm_files/ruxufuko.pdf In PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a2a216044---danaxegizawaje.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5037f119b8---81975114883.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/kovoxomalibofez.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c239bbd4825---xikojalalifine.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/6556c7161df1a4f06f8a78ae52c8660c/jowagaluwujojim.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/zonopoxupon.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160afe2020d8af---futuna.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b2a0e83917797b0318fec82ca4bc2826/vajasatenugipapekuv.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083c3bc7c716---54532832726.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/fupolugofanolisimojovab.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/q9e1pjg2ohv0713e74megumvml/vimetebijasutamasuten.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/wepisop.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/68040271758.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3e22a916e---48871985281.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/92284952187.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2fdf7cc25---xoxesib.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b538003da6---gototi.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/mutajepanepime.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/895cdb06b507b00bb2b401cf3c5420fe/22564950143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=housekeeping+checklist+for+hotel+roomsPDF 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_off00012fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000147e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E1 17176 bytes
SHA-256: 34602e1e5d8bc902a829decc442eb24ab1f32d48bcb79df28ef56f0414c54993
font_02_sfnt_off0001749e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1749E 10948 bytes
SHA-256: fcf12079c3a4a26d97cfd70c1168ed3dc7230532b0e10294608bba89f4c8b818

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