Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b1b0c1c9f0efd4…

MALICIOUS

PDF

79.6 KB Created: 2021-10-07 08:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b40efc7885cca22e6cb4313ed7fb2bd6 SHA-1: f471a382becae2d66217bebdd898886c7f2a627e SHA-256: 37b1b0c1c9f0efd4e0e29593297a7d0e17db18f495b654b2acdb3aded0d83634
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6216

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.
  • 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://huntic.ru/uplcv?utm_term=essay+in+spanish+about+family PDF link annotation
    • http://herium.net/FileData/ckfinder/files/20210919_79F11DAA53F77AAF.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c03db4161e---bamerolekokegenatit.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315063b9c26---82104564970.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/68286393956.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/39899822347.pdfIn PDF document text
    • http://kaies.net/upfiles/file/namanisas.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/suzejokexutabasizozigo.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/totunabilenoveru.pdfIn PDF document text
    • http://ashioke.com/images/library/File/40816805995.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/mirumu.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/qosmjbg8col83trfi7e3pe44r1/46372573540.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/7160190777.pdfIn PDF document text
    • https://emenu.hu/editor_up/suvunifepawoxinofo.pdfIn PDF document text
    • https://limsurempat.com/contents/files/xivefoferajawel.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/jibulow.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8af04a10c---2484459949.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/pifukegalewanale.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7dhugo26p56003k2md7d58vldj/28481143763.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/novatunivisugeluvipiruk.pdfIn PDF document text
    • http://kag.fr/userfiles/file/41882321817.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/95611356566.pdfIn 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_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 10728 bytes
SHA-256: c6c8e5dd2099deb3d70d6e6d5892b14ae3b94f7d2387cdeb8e0ab84ab1b1a255
font_01_sfnt_off0000ffba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 18372 bytes
SHA-256: 65f5b8afb2de80d87b19733297f91cf91b00e9e29df94f65c17af05513e5a59c

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