Malicious PDF — malware analysis report

Static analysis result for SHA-256 71793bfadcd4fd3a…

MALICIOUS

PDF

91.6 KB Created: 2021-08-01 09:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ec047734f9b7fec5e889869d4373c04 SHA-1: f262a2fdb84de60f4e61cd6a0a2cdc1db43bf37c SHA-256: 71793bfadcd4fd3adc2d8fc70e29acecad833901d05d300ea3262076b5493757
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest a phishing or trojan payload delivery intent. The embedded JavaScript is likely responsible for initiating the redirection or further payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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 https://cape-electronics.com/media/file/46618281283.pdf
    • https://aquaprosmart.com/userfiles/files/gexudob.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c3086e9b9---78489172058.pdf
    • http://ecohouse-lab.com/userfiles/file/36952073331.pdf
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/gawulubomodaxurerij.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dac459cbb04---madazajudisupinelafowuwo.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/0488afe5b153626d0de5ea4d481e15f9/20693075565.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e12dca1683---xipazebuxuduso.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd45959f6c---vifogofet.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9df23d134254e553e25db629a88258e9/jojix.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4a5d0e00c---fufodiwuze.pdf
    • http://bualuang101.com/backoffice/upload/files/nerenu.pdf
    • http://creptiles.dk/userfiles/file/tanukoxodivotipax.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/74094a2682c47b43b8862041cb32d881/44535919652.pdf
    • http://thrifty-uy.com/files/others/36946699005.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071d2ba47ce0---sisexijusen.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b134abb960---56864109544.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/c4b61ad8703d1dbf3ca8e9e9593ae97b/16809878979.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d0938e2ff---rerowobagatavoduj.pdf
    • http://triatlonbizuterie.cz/sites/default/files/file/nojipebixegufenifoka.pdf
    • http://shiinamotors.com/js/upload/files/buxokolajopukiwuperifav.pdf
    • http://reedxtrainternational.com/uploads/pages/file/gemeget.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=essentials+of+understanding+psychology+14th+edition
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6c.bin
79c963a8071953e915ec4737a522791cea23e160303ed7adc195f92cade7753a
pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 11228 bytes
font_01_sfnt_off00010798.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10798 16792 bytes
font_02_sfnt_off00011faa.bin
e267c44abcc8d039954f5e6620a2bdd12b09eece692d455ad35f32c3e26e22a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 32628 bytes