Malicious PDF — malware analysis report

Static analysis result for SHA-256 88808e0e60329b03…

MALICIOUS

PDF

106.0 KB Created: 2021-08-10 03:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 485b372b564b40e41a8338191b8b70ce SHA-1: f5c1a2a8b11c147ef9a2748348a86d9f2143067d SHA-256: 88808e0e60329b034d88b8f7e72b755169e789410a0c3f645f446bf3921c8d67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc84224bdae---pixawusonuzejuporimal.pdf In PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/btcp1vu6unjg2veg3ac5v1mg66/kawifapokewojimebox.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/tavuzofokowo.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/bawurisemidikeneb.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/84534336194.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/eda93e207dbe49ee4a97b2ee06ffe2e4/vujajigoxekuxopusafe.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/64135440645.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/73182852058.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/9891431952.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/c52c247325069e865611954ccec91533/toxatajulajixefod.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e99ea6359---68240272702.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/65091839670.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/d6k1fr3j1oqereq4b9jst3jqi4/39724015584.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/shblhtck65enuelm844annfdl3/nebidonolatexisufageris.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/95665166517.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/69704573648.pdfIn PDF document text
    • http://parfumland.sk/upl/nurireradexinovujokovefoz.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608945e747971---gekanuxofiwesano.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/zufalokuzo.pdfIn PDF document text
    • http://emyorganizasyon.com/emy/ckfinder/userfiles/files/27925490578.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1623515072davazoxanosajibalow.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/nuzes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+does+the+korean+last+name+park+meanPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 17904 bytes
SHA-256: edc246d320f5da5ca0825d3c6698b385afe8d5b13011febc47e44450fa89eb6d
font_01_sfnt_off000134e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E7 16936 bytes
SHA-256: c794ec0b2bf3ffdcf4cd88b022245138413e00e6019f4976aab3023ca531c175
font_02_sfnt_off000166fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166FA 10652 bytes
SHA-256: 0cb5f41a4e1bc27a4f6bd13340603d51bf644173a2bbbc8c6c7d56de7a6785cb
font_03_sfnt_off00017f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1