Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffe31a4138d35cb…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 18:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8467eb878b3931d3b9b60388365a33c9 SHA-1: 038d86478102b7b9aaaca1cd654f276153dfb354 SHA-256: 6ffe31a4138d35cb13968fef9fc29743f6811da0b9ac2b28f9e692a368556c1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the link farm strongly suggest this document is intended to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://hqshop24.com/userfiles/file/75615946344.pdf In PDF document text
    • https://trinityautorepairs.com/uploads/files/tazebig.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ca0e55614---78513127911.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/sotes.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/gawagobixiluranakugaleju.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc729784e---94281336043.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607399f800601---bibinigazi.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1d4fe7bf94107abb58955410a1b46e1f/fudatedijesizofimi.pdfIn PDF document text
    • https://kham.vn/userfiles/file/13831716493.pdfIn PDF document text
    • https://olterus.info/contents//files/6477940422.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf03daabc1---tageragir.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/rexavidevi.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094310aa6395---jewadil.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/zisokuxij.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/kanozufukopi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762f8d470cf---mosezemivapojetebemafude.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/rurisefexike.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160944e55bbf46---kikovolisivazekupifiwaze.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/zomijonesemaferot.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/rebumoluzipejamusalubu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160816be9aa498---64666476477.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/58697271177.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160840d64a89f4---pibuzadupafokudukib.pdfIn PDF document text
    • https://bor-diing.com/upload/files/72899156493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=general+knowledge+questions+with+answers+in+tamil+pdfPDF 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_off0000d397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 11408 bytes
SHA-256: ba3009c7226c05a8777048f3cc7e626b1eaf65fedae687257652cd6f04708438
font_02_sfnt_off000105f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F0 19380 bytes
SHA-256: 2ece404b6a06f8b12fb92dc1389eaab4a63c6f6d4baf72671accc89b6bfd6fbf

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