Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcb09f2c4970241…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 20:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4597c6c2e6e757ee2f2c384d71e7ab1 SHA-1: 34669d9fb3ee06750e452ae02df6acba14a90e43 SHA-256: 8bcb09f2c4970241fa350be279c9644855d8caa9d95e4eb9a05af9bc94a0f25c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting it is used to distribute further malicious content or lead users to phishing sites. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075101e3685b---jegapepominijodu.pdf In PDF document text
    • http://stromzeleny.cz/file/86376872522.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/gu2v50sl0qbfv5n04rdlloauh0/lenevopoxarovamevin.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65380699984.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3d456116---75195380301.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/73282266232.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/1f78451b3ba89309b84f41f1c3925b35/54710695627.pdfIn PDF document text
    • https://invest.pl/userfiles/file/ganude.pdfIn PDF document text
    • https://laps.pl/userfiles/file/vajokog.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/lawero.pdfIn PDF document text
    • https://congchung7.vn/upload/file/63767650719.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087534389c8e---kemivoraxa.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161255686e449d---69151407087.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/41540277012.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/37013869572.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/gupulubivawiket.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f511f6b3a6ca64de87e6a2813ca8e0e7/jegekaxijiganenafevimaxu.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/vapeviwe.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097deb957125---lixagedifo.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/xepafijipupukubidusu.pdfIn PDF document text
    • http://polletnv.be/uploads/files/rorekojufudegagapigude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=applied+biopharmaceutics+and+pharmacokinetics+5th+edition+pdf+free+downloadPDF 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_off0000c1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B7 19052 bytes
SHA-256: bc4422b7f9021f8fa77e093654fa8f0125a31685a3beecd8af1ca939b8568f95
font_01_sfnt_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1C 11416 bytes
SHA-256: e1d031bf434b9af12c84738ea6dd598d1cdac7ec7e5b654653ccd331185ace34

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