Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6f8bb7a03302c4…

MALICIOUS

PDF

70.5 KB Created: 2021-09-05 10:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc6b031f7a021f614f2c13ed30e7db80 SHA-1: 39453494ab2c4e0bdc4201bc8fbc66dfeb44de5a SHA-256: ff6f8bb7a03302c41af253fbb2c92ac75c702abc12436df8c8a851adecf1032f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier also assigned a high probability of maliciousness. The primary attack pattern appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://shethof.ch/cgi-bin/dynamisch/file/21528634403.pdf In PDF document text
    • https://toskov-yordanov.com/userfiles/file/banafulejexutobuteliredis.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/82282376363.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8855e35fd---58534451693.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d685374944---67290522144.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/rewuvizu.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/77288720504.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/22602598576.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/58512461686.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16081a63d65b2e---26739351271.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//39615323867.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/63f0cbea6ba0a644de7bf7fd4566c536/68216145622.pdfIn PDF document text
    • http://rivucota.com/upload/files/delafaxofoduworaroka.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/daxalowiba.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/15854974289.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/3446fdeeb4c4c9cced8bd1c259a973b6/98263418604.pdfIn PDF document text
    • http://twilaw.com/files/files/wimaderipelubuxurivumu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c883696840---mogediwigiki.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e3f97d450c---xiziximubidepidowude.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/33724775433.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/pifaluvepesemipuzefeb.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e66720dd---miwukegekivoko.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/lilixunoduseruko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=html+to+pdf+converter+software+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_off0000b337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB337 10832 bytes
SHA-256: 0f54b232d2c57e709d5d9f3476226670d38e9982f2e8751b3e41e83d2ab46e9f
font_01_sfnt_off0000cc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3F 15668 bytes
SHA-256: 090fbe0ffb6828d8eaef1075d69766f89fc8f07dc24c19f372ba666c15c2a694
font_02_sfnt_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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