Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da55418840e133b…

MALICIOUS

PDF

92.0 KB Created: 2021-07-23 22:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0db1b6ffd2d3024f3f0a95b2ea9ddc95 SHA-1: 9467014fcc9ddc240a47ddab8df33ff33ce6dafb SHA-256: 6da55418840e133bd93feaeac243813cbb6337fe940c28f9c5118742eda33641
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/58709911335a54bcab05c2d653752ec5/tewawijotezur.pdf In PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wururiguw.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/bojikomutudiwovelad.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/jodatibusi.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/af68138fa3d38f8912ec315df7d01e93/61342580875.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6dcc67ea9---20815770600.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/27247174143.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/kegugume.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/j7ugqsj8raofeab0jpmame8g01/bupek.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/12304230132.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021060412291273499.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093af7c46d5e---besesadoxagujorufal.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/23762670446.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607585934a153---jepoxadulig.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/bajexudux.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/11178580968.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/46842696816.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e33db3f975---fokopusagivowogasibi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/20m7olhbbc282fu8n9s8ne43fl/78342330488.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/22dc8b385dd051a815b06b2df800b75b/defirajub.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/1msluc1v73l0o13gqs3gc8caj2/45338222577.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/uib7poekvrgrgvp48hq8cpe7vd/vupabubatoresox.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c897edcf---sixugosivodawimeriwipak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=jimu+robot+unicornPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/72b01498e05f6c8ea1e14b4f801eb1eb/sureletatarozidafif.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_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 19968 bytes
SHA-256: cb96a15ea169a938c89fd339aec8767d823874edffa4f6f419e25fad2c0b5eb6
font_01_sfnt_off000134aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AA 10116 bytes
SHA-256: 11b8498f77a31cc14b5576ef32c2cbc455008533174e8d90f0741cdbd05ff32d
font_02_sfnt_off00014b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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