Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c08625bf83bbfb…

MALICIOUS

PDF

63.7 KB Created: 2021-09-18 14:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 905c6ce69c994be4b2a0112c8ca1d5a1 SHA-1: 493b3303fdb7ad3269a261842d398bf8740d5b0e SHA-256: a5c08625bf83bbfb2cced54075b895df2fcad75085848faee23a44d7dc5fdd2d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9231

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=android+widget+countdown PDF link annotation
    • https://quangcaowebsite.vn/uploads/files/lipaxijoratazi.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/mitusofajawajexuxidix.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/53532403674.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/xavariname.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/3979344623.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd8a54b6d1---98115041233.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca89bce40---1879191497.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614554b3094a2---xesawa.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/vorigu.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcc548277890b7edc018ea68a0f873e5/15406823176.pdfIn PDF document text
    • https://kermanrooz.com/img/files/vumiguvifalilabo.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/lerejoxuteniwitopurisoset.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/vatufekapawumif.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/nofir.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/rolaruzekopozefokekixava.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/40695617172.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/79776974774.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcda03abd9---dikutuvigubotobofip.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/92888706034.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/40871437849.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/20901737555.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/futogowuza.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/wokejunufobegamevu.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/72019468758.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_off0000dc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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