Malicious PDF — malware analysis report

Static analysis result for SHA-256 36fbf40d7c4a8492…

MALICIOUS

PDF

84.9 KB Created: 2021-08-05 21:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d317108563682650295e59d0406902d SHA-1: 265345d7c69074253381c70aa228aaaeb9f15bbb SHA-256: 36fbf40d7c4a8492bf8dfc4c235dca2538b676d44cf1754a188a8e54a1c0b1e0
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised websites, suggesting it's used to distribute further malicious content or phish users. The presence of numerous unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6502

Heuristics 5

  • 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.
  • 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://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078643297bd4---50034490829.pdf In PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b1313201f75---46228446720.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/lefexulur.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/16477410230.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/9ff39cbb0e941481f41d86c27aef392c/mepiledenisenowi.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f62f5355b---67020995946.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/vomixivugilotexofexogiw.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/22726133620.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/rozugulokalipuwojamif.pdfIn PDF document text
    • https://avenue102.com/uploads/file/25098978684.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/gewozuta.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/e8e259c58e9245d2ed635b1c3c8adeac/xegojabiwibofomopuwe.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/fabomamaborajizinipuvite.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1c61eef701e45afbf222d22156881b1a/23861657908.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/1151849972.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/21262518857.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3cc07dccb---goxodivanuwazogudamulek.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab413bcc68---40168266975.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a840bf3f49a---57077510649.pdfIn PDF document text
    • http://ilovemynewstemcells.com/clients/865932/File/72222863617.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/86a36951e0115066aebdf91fd0000242/wozupiz.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160705b8e846d4---renope.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b87dbddcf---51139559357.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/97833463395.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/69031843431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mad+city+hack+auto+farmPDF 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_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 10592 bytes
SHA-256: cc8caf2c7bcc1249aadb0057b83b641d2a4433ef3988c335716df304f5693782
font_01_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0C 22300 bytes
SHA-256: 0f1a76ecc239950e185dbf76a9e49a0c4ce6e4161844c727d4e7ca377b00f160