Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71cf9a27f739b6c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 02:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 01c643895fad6cd6afa14f25e6325256 SHA-1: 17d40b68467bb442ab19c184cb34a5989bcd4e7a SHA-256: f71cf9a27f739b6cbe5800b6aa21ed70afd4c43ec350ce3bf817b28ec9031dda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malware or conduct phishing. The presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=missing+parts+subtraction+worksheet PDF link annotation
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce3cda0407---44860909538.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/jexatexedo.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/judixewawakozita.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/26701352390.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/vesoxukafinupidititiku.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/39418259571.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/42021084237.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/4649f1fdb3a921534b8f8a715c3991e0/97170115972.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/bupuriganetosixupod.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/bunupubeb.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/93517092174.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2b7f83a6dfe93cb9dcc0ae4f6c5f2f29/laxaxi.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071a52cea9ea---47665005841.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836ade85b67---dazigonasusezexomewori.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d7cf4ea9fd2---19816947861.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/38863456595.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/nagawivalowudodixoxuvetad.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/vufovedujofobuxigutesino.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/rakaseka.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fc449d175---75652700786.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210730_E498A1B490C742D0.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a46242a093---43984668601.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160803e34a0cf0---wakojafase.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/6029869880.pdfIn PDF document text
    • http://eurekaloggers1970.com/clients/a/a4/a4917853023b9a70bc4506ca58f09c65/File/jivowarovibajejeviv.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_off0000d866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 18152 bytes
SHA-256: 3282627a9d51e64bfc52872694ca339c02f5b764b454afa76337fc030016063d
font_02_sfnt_off00011f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9F 11016 bytes
SHA-256: 39de80b105b423d730d313bce4db1dad8fd3f1d02746613fbd80698284efc570

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