Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb252ec181b9a25…

MALICIOUS

PDF

98.5 KB Created: 2021-08-02 01:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d140a3f4688e75b5049572256a98e041 SHA-1: 31057bdad1c904d836b48b0a3ea850c3ae3457c0 SHA-256: 8cb252ec181b9a251e01f7cb2b96571cbc2a4beae9676cadc54cef4575f91d74
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The presence of UTM parameters in some URLs further supports the idea of tracking user interactions for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6179

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://ketchas.ru/uplcv?utm_term=ejercicios+de+arboles+de+decision+resueltos+sencillos PDF link annotation
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5764af1a---begusekoj.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/s7spn67rccghvqu5eaeegpt6r3/valitetaz.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078aad5b4087---rafavede.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/833fac6e163a1e1f990a7fb522e44693/96123156861.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ud63j0ed2uhuctnejkng99nis6/soxizojeduxodike.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a0c7525c7---70950659267.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/zabiramedavolikel.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/74024944094.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/37508749475.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/lutivukemunizusowesiv.pdfIn PDF document text
    • https://defaico.com/d/files/vevazirefaxexomobanogot.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089f7b7639c0---tonume.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8733f38bdd---lokug.pdfIn PDF document text
    • http://m2m2design.com/userfiles/38849319496.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/44366243208.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/2ibs9rlkglk7g97l7rqoaa8n06/visuzedufopijivanozat.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160826827cf80d---21066771130.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0c05e887d3e6ba86e83cb267f93ac2ad/83200747403.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/d07f31e5d958d4477f39561c3a501b99/5125368630.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/7239532473.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/80981782353.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fc5ff20e0---4622965559.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/larifajomo.pdfIn PDF document text
    • http://ibb-online.ru/f/file/19567968134.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/94276926479.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/fe28caf923079bdfadc07532a0acc28e/63942528640.pdfIn PDF document text
    • 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_off0001539b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1539B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1