Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bcdc18a6cd20b4…

MALICIOUS

PDF

85.5 KB Created: 2021-07-03 02:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7208b8eea028b511f9b9b8c59f46ccb SHA-1: 65b62a7c403c8547992e8318c18e71dcaeccd297 SHA-256: 91bcdc18a6cd20b44c12cd16c2c036fbe17a016bd98f4fc29d1850ec4cf565ac
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, directing users to numerous external websites, some hosted on compromised CMS uploads or disposable domains. No scripts were extracted, but the presence of many URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://home-consult.lu/userfiles/files/wixadib.pdf In PDF document text
    • http://www.urbanwaterways.info/files/6413636016.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/57e2a7ea4f4207e9dfd0983704529667/94919790628.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/fegufejudaxenovapem.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/kuxibamifaxegel.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/804a01c0220e2a88efebeeea406243b6/basimesimivoti.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160999ff4ef684---mifajakipebivutupek.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e519ea49---kuvolowo.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bceb440a803---fomumuxapokezibisotifapuw.pdfIn PDF document text
    • http://splogservice.ru/content/file/nedenap.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/025babca1971b62835787e23a78a79c2/78483759350.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/80973766996.pdfIn PDF document text
    • https://anfauglir.com/images/file/80489946619.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/bevup.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/r2dr7ergir5qv87gulrcdtdmk4/razelanol.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed4d8e584a---bunifononuxogumarek.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16074ae0f1697e---josunadudofumezetomefowaj.pdfIn PDF document text
    • http://mousike.it/img_ins/files/39422367024.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/wawalepobezuted.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94203995567.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d71faa66a---57944748556.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/54101687700.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/56409977899.pdfIn PDF document text
    • https://capecoralliving.com/media/file/dixuwujowagukin.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607251f69a63c---3323534414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=medical+term+for+removing+excess+fluid+from+abdomenPDF 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_off0000eb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001033b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033B 16568 bytes
SHA-256: 2d6914cac24adc65f4a27d3f69a998a7e975b249873296ffe8e63567b4c8839a
font_02_sfnt_off00012dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFD 11220 bytes
SHA-256: afff3c0a5f3c71b8833ce8441d561e499252198f2e2b23f3700f0fba4b452949

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