Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e286e28ab02237…

MALICIOUS

PDF

72.3 KB Created: 2021-09-04 15:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7f70853063ac228aaa47d44bce504da SHA-1: 72d9220907ab2e4eed583dc332221ab52ecab5a6 SHA-256: 52e286e28ab022374a89fae8aa7c69b87beba62bbfa98e4c2dbab6e7be1a19ed
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 hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://coretry.ru/uplcv?utm_term=wired+magazine+cover+pdf PDF link annotation
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/6f6ffe01e085fbe0fffcc6c037dc3bf2/tigisu.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/rozovudisagujetibijixunik.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/sujn0iav074o9ji0v12707ii27/68703964940.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/vijogelojokijinebitor.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/rudinotag.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/vigefisasizodaku.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1942419379cd1e0f381389e854f7b2e0/97898068399.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160863ff5912b5---7243520497.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b295650922d9558ee9b046007516815b/88098691420.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/bepelasax.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/nlegm038rg8s7lt97eevi8hd51/23629351401.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/kosikotevid.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/23974593786.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d80a17e7c1ddab776aefc733e17c56c0/tarozunakolesomiz.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3g2ub7eu028u62jdl2ba74n19d/tedagagewitaxenunasalika.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/89489501736.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/57a387a39b23d3b1da5476901e938b87/nijovipexidojaranotu.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/27834625877.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/bok2a1ark7679ke00ql5svpem3/sisej.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/66633822498.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_off0000b870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB870 10768 bytes
SHA-256: 16850ea8ee9b04f17e766568ee297c7ecfee53ee0fc723537e6bb26e449286ba
font_01_sfnt_off0000d103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 16644 bytes
SHA-256: f5c0edfc3f535c7788504fb486475397cd648562a84e0adb365aa3e2dbab6937

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