Malicious PDF — malware analysis report

Static analysis result for SHA-256 f188b6ba0c4c9d0a…

MALICIOUS

PDF

72.2 KB Created: 2021-09-03 04:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38499b5e6ab04d7c39b272547dab745e SHA-1: ed0b2804e83d6deb19be0c6c40b3320d320adfed SHA-256: f188b6ba0c4c9d0adf43be3fb3668a2ec4ad3dcf9ff4bc7cfa3790ffad8b85e4
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://castrolmintabolt.hu/images/upload/file/gakufozenosupalizakagubu.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/4f19c8470e5d9594cfeb990fdad3b465/gemujimifej.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/58786279686.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/kofurure.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/nebijukafuzusipuvuw.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/vudozazajufokigerakibusid.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/715ebd6d5529b78d63c60663ac6a5ea7/94013756394.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/vatuterije.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a011782ad3fb519b37aab614465df082/zabeza.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/vewiwopixom.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210701_165158_3454.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076dc5911a46---zusozikiwaximoli.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/xisagusunetesif.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/mudiwekamufuladudivofono.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b66716644ef---7032857899.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/60885914635.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/dokevepafa.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/60467bc9a6e88477d3cc39dae4a3a1a6/34347734189.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/3f42219d36a4329dc59561ff1e6481b9/94389990284.pdfIn PDF document text
    • http://zxsolar.com/d/files/37952274852.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210704054948_5gylop.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6dc32255b0b49732d748077d7a91599e/devifokowolenexaperoloder.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118456ea0edd---12384003281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=annual+church+planning+calendar+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_off0000bb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6B 15580 bytes
SHA-256: 024aafcd982b31dae7298d575f28ebf20b44d15702afe9932d54c924507a645a
font_01_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 10596 bytes
SHA-256: 8075ea5429e1916ae4cca193cb4c3c9f1f0d1f5f81d6c4dd9f435c321a211f69
font_02_sfnt_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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