Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8f606e3ac1f772…

MALICIOUS

PDF

54.8 KB Created: 2021-09-02 19:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb135f5f38ba18f0a6d9f9c9109a6900 SHA-1: fbafe13ee57ace5f6e3a6a6495e7fd152dc87759 SHA-256: af8f606e3ac1f77208fc3c2b5650a1df38d258185e76b86960cc69c66182c36f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. While no scripts were directly extracted, the structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8270

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=mppsc+mains+syllabus+2019+pdf PDF link annotation
    • https://manuscripthandler.com/userfiles/file/tujujemazupujoxa.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/fowusef.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/75qgpshcggkjvhk84guvk54n65/putisobepofugeve.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///16934211318.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/78365343942.pdfIn PDF document text
    • http://snft.ro/media/file/vejoxupepomususipurixur.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/b9ad579fb8ddc281513b4d2efbf123ca/dapuw.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/gexipulesabudovinad.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/38511220686.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6cb93d4eb4cf8df35ebe35cebcfe0220/57680834148.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4266c901a---51998790433.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160945b6f6ac43---gilalata.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/9d52a1581f75b9a861033a360608cc2f/rakajalamugam.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6201720ee---dinikiju.pdfIn PDF document text
    • http://huiking.cn/uploads/file/312146552342.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/15931498051.pdfIn PDF document text
    • http://hkalc.com/userfiles/47281390885.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d66b7a08a5442af9004098b96e0f1d95/99970748462.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/34021613124.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608686ae91204---lufufojibixedowenafarewu.pdfIn PDF document text
    • http://saptpadi.com/files/file/kezuzimosu.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/72003378656.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/63156678246.pdfIn PDF document text
    • http://cudicio.it/images/file/pizirigimekulaxudedonel.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_off0000bc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC34 11140 bytes
SHA-256: b11a515831baa3153bd1d684fbae4b5970f59cd2f0100d321fdf942cef2f0e7f