Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bd15fc739b4cbd…

MALICIOUS

PDF

63.6 KB Created: 2021-09-05 20:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6c4168de3d8107d80951c3083620fd6 SHA-1: d86e3de93a30aebb8e371765b12fac9cdbef1448 SHA-256: 59bd15fc739b4cbdce1687b633564d4cb6563df1b0c1b31081ca248971e0ef74
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 compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, particularly those hosted on compromised WordPress sites, are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9486

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://calmoinc.com/upload/editor/file/48406108177.pdf In PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c28db46ed973145f87eb8441964d589c/81778475940.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f89edf62201feea989b1bff57b7e4917/tazokutulopuse.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/5920212327.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb1b10ea2---zimuzumakuwikejopi.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/80630341607.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/848b124c2907e890d03963472795357c/87156635477.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/8j892fns5o75lmesjj2c7rjamp/vewesubarifas.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/99d31915f0f5925e7fa69fa9a73fe887/84558070177.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084da0f5a7ef---wijukifutog.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc2379a516---10262438981.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/79098219177.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/52505709626.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c91e48518---ninez.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021728110361995.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/iqot2e7hgbuis1oqqjvp9i9i2s/88359336430.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/10e8e6c7f51449dcdda9fb192660eadb/20872732724.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a43c82ef0a5---39816752431.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/zinevakosubosadonitare.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/12595496034.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af76b294cb---1755367835.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/kaxobujuwinurunose.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6d5c71736355e764fc3012969d64fb48/7088495124.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/d96985a99ec0e162fa1e4d83f6cd8c70/fanuwetemaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dispositivos+electronicos+floyd+9+edicion+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49D 19260 bytes
SHA-256: cd57bd1892cf95da001699dc6a293c90afa2639dd2e424d3cfcddbe1eec382a0