Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdcd0a581b561d6…

MALICIOUS

PDF

79.0 KB Created: 2021-06-29 04:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 397907368f89e38d3f771cacd0c8ad64 SHA-1: 55fe6adc5eef10505d7fc7099ef36e999470ffb5 SHA-256: 3cdcd0a581b561d6e2c2f38a19c3abe890d0dddb10766c65fc032878de0739a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains numerous external links pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a link farm designed to redirect users, likely for phishing or to download further malicious content. No scripts were extracted, but the overall structure and URL patterns suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9398

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 https://drafthe.ru/uplcv?utm_term=turn+out+meaning PDF link annotation
    • http://bonfiremadigan.com/uploads/fckeditor/file/vakusoluximoxuxutututuju.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/xupofikubikukifolus.pdfIn PDF document text
    • https://ka-base.no/images_content/file/43343375098.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210527233730.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210510184543303981830.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/61715977244.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/vn9g37oosaflm7k0m4o0lebjmc/12637552284.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/afab8f864b0ffbf40209f55f95222087/wazibam.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/46933732432.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/xufemefisadokavu.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/42130338877.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f3fc0cff46fc81b9365613f9861a2be0/47578705989.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/3u53ndb5lmpgb33mgvq1o31c5c/dewujutituzu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d40ba72ac54---befagujiso.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/93b7226da406f00bd423d17ca6192838/54573680758.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/57773636541.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781c4ac3a89---gonukozukoreninas.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/tizevilujamezixule.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f47edc66e---88002245868.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/hucqn6632nlkdmqu43m1k8e0pp/96161152690.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3708ef7bc58a64da6a681853911c2d08/22668679553.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f5233dc21---90221209107.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_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 16120 bytes
SHA-256: fc96bb51e68212267b34b5acefce01e3ce1e469c7be8c0a453211fcdfa4f682a
font_02_sfnt_off00010bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFD 10300 bytes
SHA-256: 51585caf54cba03c0dcba5c944001ef93ab0668dd79cd2085945db4cbfd8c932