Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d3cdf8d9310a3c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 22:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd2b88495501dcbc5d26574bd07307d2 SHA-1: 80acf4113f8b4fe812dd94a1ef01b590d3e46632 SHA-256: f6d3cdf8d9310a3c46f08375cc92f334d69aefd3034f5eac61d7c15bb88cec05
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 high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous potentially compromised websites, many of which host further PDF files. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a pattern of using disposable hosting and compromised CMS uploads to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1674ca6b8912aa2f32fc19386a524c27/32362101514.pdf In PDF document text
    • http://ahlhy.com/uploads/file/100631141992.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/74209108758.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/0db06adf63042ef598db7df21da8b4a3/nesekirexanuji.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/e43be15dc25a4fc498b8d271120cf4c7/88611679972.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/85037058195.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/bipubasomof.pdfIn PDF document text
    • http://billsky.ee/files/file/risola.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e6ff43e2a---56922693045.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611391e603cf1---sirosopulij.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/16932710759.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/wibel.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608082e26581e---12164986434.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/refu4bd2p5vqf0ikdrn87f5vc1/tanolurozanekosekuxabut.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/bididaresipaf.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/65afd1837350f1c5fed55c4976a943c8/kobere.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/96898747060.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/72845589796.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/50651806037.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/o3l4uveeu0bh5ev3cq66pqvt13/gimusuxikidubimitefo.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/5436917906.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/minafavogutirevekogew.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zujujuxufigibosedonaf.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/linurufazatekisapop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mean+sea+level+is+aPDF 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_off0000d5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 18008 bytes
SHA-256: 605c835f30d486b3053481464585c7785de0baad2db6a1bcb872fb54871a4e32
font_01_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 9844 bytes
SHA-256: 197b87414567e3e8c283029138197214eee2e7abbb45e7261c08794e489269c8
font_02_sfnt_off00011a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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