Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf57fc96a1f0da1…

MALICIOUS

PDF

80.9 KB Created: 2021-10-04 22:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fbd0784014c5e278e26130da8c03316e SHA-1: ec97e08ddce70684d4db0811f5d8892c4f789c3d SHA-256: fcf57fc96a1f0da19768a515d8b13b45122e0a5921094fe37e9fa13e42c1196a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5559

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 http://brickform.cz/obrazky/files/22081388054.pdf In PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/94758916188.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-26/20210926211804331319.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161561ebc6b80b---xizejiwezuratod.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/loxopopetepo.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/matomujezedetegabatomop.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/zepatevuwojuwun.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477c399b1bd---72860614559.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/40250042327.pdfIn PDF document text
    • http://hidropro.hu/upload/8462755091.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/91432319888.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/93533492663.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/lalalanetiwajekakarodi.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-18/20210918083108660353.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/kigujobe.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/vusepevefoxusijuzigaf.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb3b5384b1---sarosalaruko.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/51671998324.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/32644674617.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/didelogafavobirozevuviwa.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/vafigaxazalolakinezojidi.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/94528659227.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/29230921876.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/56553957563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=back+in+the+daysPDF 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_off00010466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 18144 bytes
SHA-256: 9072002c9b3e38ee3d0d9820d63b541d465935211aeada4651c00c3cd6bd7fc3

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