Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8541a674cef7282…

MALICIOUS

PDF

95.8 KB Created: 2021-07-28 03:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 00268dca6f10fbf4196ddbb067ce5b20 SHA-1: 31e62f9cdf53e6e414afdb78a8aaa17f061819cd SHA-256: d8541a674cef7282e3d2d39381cdb9645ca39d8d6e53db292bfbbb30c54d3b09
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely to obscure the ultimate destination or to host phishing content. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4108

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.
  • 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
  • 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://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/87d11c4d8a61bb969470ce4b8fdd2f32/vidaridopa.pdf In PDF document text
    • https://hobbes-group.com/upload/files/fedeluza.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/fativefurojelakinizan.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/79866451405.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4db66a8a7---11081657396.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/98904665578.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/fc1e355bf51039c186bafafd13c1a9b5/27084366201.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/9cptqci07ghmo6m6tap7kblnc4/jevemivibagomez.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073ffdb3180e---58914660147.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afe9d78c5ba---33345257990.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/koxufi.pdfIn PDF document text
    • http://cl-pub.com/files/files/10188839003.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7dba12b8a909883740365680ebb36fcf/getofajekupiladivoluwefo.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/rolanelel.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089f44ec0d0a---30172614603.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160881a3c38b4a---lulubikisituxaj.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/suwawo.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/ribuvigosidanobegi.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/84866422160.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080bd4175841---97687674886.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ookfpele8mib1n6els0r6nnv41/nadokimodixede.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93902788054.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8be37970170f64a790a7a674452d5ace/kasolizanijepozifiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+are+the+features+of+bryophytesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001263b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263B 10560 bytes
SHA-256: e59665a30f5e0bf1a90f2e414bd623b3ceb5dad14f3f3e99ada05a64dd6de920
font_01_sfnt_off00013e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4C 19316 bytes
SHA-256: 07bf46ebe5c82546a1d382e5af8c726e90655d0d8c693d45ac1c6610cd45f834