Malicious PDF — malware analysis report

Static analysis result for SHA-256 119bf8c433d872c9…

MALICIOUS

PDF

95.7 KB Created: 2021-07-25 06:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d694731b29eb2e22b1bea0ffc1566deb SHA-1: d86893baf3910b87dc02d07651d64f744a1bfb69 SHA-256: 119bf8c433d872c9de3e808b0dfb94e03626a1ab36bd3a4b2ae0485cba24169e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a significant number of external URIs. Several heuristics indicate that these URIs form a link farm hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript, while not fully analyzed due to obfuscation, likely contributes to the malicious functionality, possibly by facilitating the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ipublicity.cz/data/file/pepogudevotika.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97aefcab77---26741363964.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/putofag.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c0a1010c9---biradafofisolitejimati.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6c4e8d78cefc1a3804b6e6e30e3bbac8/15410863443.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/bifijixowo.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/3401083e6fc0fee9cd1d1b8bb0534cd8/78433355791.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/94182798548.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16094911f6a155---puvivilavavubukezinetu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db78538e96---24767443876.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/wiwudo.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/narofukijevebetabuvotenus.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/adf21af6a85cb70ab903012a268a4e2a/39612432279.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c2bea4e1e---80186272480.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ab0d5bd04---26052782907.pdfIn PDF document text
    • https://digireg.nu/upload/dowesakegojokisadenu.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/61864429766.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/gabigela.pdfIn PDF document text
    • http://ave-france.com/pics/files/73989349704.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/r01v95rbniciupjtnsvfmef9du/xaropalasewafu.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/47865843440.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/jelaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=clan+7+con+hola+amigos+1+%C4%87wiczenia+pdfPDF link annotation
    • 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_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13163 11288 bytes
SHA-256: b320c32c6597137b061edd201a9469c731578aae9364be30c15b3c41f39b2fc4
font_02_sfnt_off00014b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B64 20368 bytes
SHA-256: 5b6c0b7f226650ab57e939eb45c1005b368f95fed4f0ac0346e5535be5018496

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