Malicious PDF — malware analysis report

Static analysis result for SHA-256 044d6593c4853f5d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 02:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 590d31fbf6d72cde1484bce9d304f13b SHA-1: 67ffe3cd7b8b7639e4b46472eb54b1a7a58d32a2 SHA-256: 044d6593c4853f5d551a26c4abdd4299947e2c98146b04aa123e6300315ea133
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://queure.ru/uplcv?utm_term=chronological+history+of+english+literature+pdf PDF link annotation
    • http://autoscuolapezzano.it/userfiles/files/wipinaje.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/pifavokufufisebop.pdfIn PDF document text
    • https://birudongker.com/contents/files/xidatavogojurawewawofu.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160913b56718fa---88718587830.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f34b14294---2447001300.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210725100459.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/nedigamudaluzixorezi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f204882435f---dawibuv.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe8d5af856---fonunepudu.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/36190826012.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/fatofadibazajodaxova.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/1696101755.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/rogowagedovad.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/8be7853c830d50af369d43fdc5f57dd3/60629893038.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/pamerotolopokup.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/jevexugamigevedotibedager.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/tajosuxolo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608db2a831bdb---75085873862.pdfIn PDF document text
    • http://www.heksan.com.pl/file/14589822048.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/28454791470.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/podenar.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/32cb680f99e0143b1ff961c6b48b2fbd/rukepinobowowugit.pdfIn PDF document text
    • http://jarosi.hu/files/file/kunidojunarofofikukoz.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcbe3b64d5---16478262503.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/mujosutapalalasure.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_off0000ccb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB7 20140 bytes
SHA-256: 4c07de8c3fa4eec98892a1dfdf87e4dabb7f3fd943295f54c134321cbfaa405d
font_01_sfnt_off000101ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 11144 bytes
SHA-256: ef968b8271b6c5f80ddef56dd2c92ecd4a909e277ff4835654d189ed85fc208e

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