Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8777b86dbefac97…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 13:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: edc38a6b1783f5a6980da2a99d84fa2e SHA-1: 606b45c24dbe55850d795c6d7ac0a90a9d959de4 SHA-256: b8777b86dbefac9775066aea06dd5b866947811b356759d3762d3815bee8e795
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, several of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://indiachristian.org/uploads/files/28907178527.pdf In PDF document text
    • http://umhouses.com/uploads/files/10048773470.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/5703733773.pdfIn PDF document text
    • https://profm.hu/files/file/ninusijapuxunovujuvifin.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/mavubujukomemogeludig.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614195d556311---70792396235.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/94096030598.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/kadabiz.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613006a54b96d---21809640337.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/13143587172.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/74539888994.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/miwesed.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/muzewalinexefajelabum.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/poduju.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161300587664ab---sozalorowexivufuxi.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/witofopimiradenemo.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/62816532995.pdfIn PDF document text
    • http://test-immo.com/file/vusadesipafulatekesugari.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/77170827066.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/55816734096.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/jowisoneruporufol.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/22206519164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=redmi+note+9+pro+vibration+settingsPDF 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_off0000ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAA 11108 bytes
SHA-256: 032c256a8e993cd139413ebe099e205986debd6e81ed9ba093a393393c8846b2
font_01_sfnt_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 17260 bytes
SHA-256: 82c5a2c8ede27f3313899174ea60f0fd015c7df252ea4856477b0d67a9d6f271
font_02_sfnt_off00012395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1