Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a2d99b018228e9…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 23:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef41fea6c6133647d36ab132ba200e8d SHA-1: 39ed287ba14d4c8993043542626d88d5a6bb421d SHA-256: b0a2d99b018228e9b6be1111fafc3f2edf09ba075177facf80b2450bc7785792
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution attempt. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://baoveantam.org/upload/files/58407506667.pdf In PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/06a313544e92017f3d99c16ce8c68d1a/rifefidifotejukiximeb.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/8066494311.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/zasixu.pdfIn PDF document text
    • https://sanagustin.cl/files/dasawitisujefowejumedivap.pdfIn PDF document text
    • http://coachhouse.info/assets/file/lonirobiguzupinizup.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d0b2c8d8---66098377929.pdfIn PDF document text
    • https://ambalatender.com/upload/files/loraxiwogivawazosisawu.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/jipebotavamez.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/lovutanotivobokipog.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372c3f69b18---seziwizikozizogadonu.pdfIn PDF document text
    • https://ijp2.com/contents/files/62975275175.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/xoxotitu.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/memuzovumofuzelopivaxu.pdfIn PDF document text
    • https://geniodelweb.com/file/domijaguzi.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/92030504615.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/birixawidovijadu.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334420d2f66---gerofapopuputaxelagekum.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fabc6b4a4---puneto.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/wemizad.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/68457114804.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/2057649559.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/44983316878.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/38048668375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=modern+family+season+2+torrentPDF 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_off0000d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 17788 bytes
SHA-256: e9442cd55f10c9ed506d26eec2b8023756e8166605b5ab2f9f6fbbc2d59e9649
font_02_sfnt_off00011f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F27 10740 bytes
SHA-256: 2af78fc7f82e889c49ea244d34ef531662d58ab1cf17c4104a8fe19425c63413

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