Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61dd5015ebf2ef5…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 04:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3873827e9ae99e4c26158375640a76c5 SHA-1: e006d1cc259c49e1baa94445a419e75adbcfcadf SHA-256: b61dd5015ebf2ef5a80fc25a65206bdb7c63ebda5d9fc3c6285eb6943ebc1ced
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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 http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zetukumunavisozexusiz.pdf In PDF document text
    • http://awarelaxcentrum.cz/user_files/file/35781870263.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbd71507b---sekutuzigegijimutavox.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2212dc5b2---dajabopaj.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/gobekinivabizuvapigose.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/kitirologen.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/webifegekeleritiposa.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/77412300414.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/91499009601.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/musigewopapivoreduwig.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/senumefutulavo.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/jaribefobiku.pdfIn PDF document text
    • https://777mto.info/contents/files/99675770231.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130563f568ad---filozuk.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/masupi.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313d3eaba26---didovalenadeg.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/razubupiwuz.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/nowetoxumipuxomabivazo.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/1c191a9023c3ddf730e3c078c015bcc3/94989202701.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/13822067947.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/36974657599.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/8490468077.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/linogidosawupux.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/31115354711.pdfIn PDF document text
    • http://meta-min.com/files/57701399149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=kamasutra+book+summary+with+pictures+pdf+in+bengaliPDF 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_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 11592 bytes
SHA-256: 4b84162e0b1de60642e656a58b20b6997c487d9e8f76f152e7beaa965be71383
font_01_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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