Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a21d1d321054e6…

MALICIOUS

PDF

83.2 KB Created: 2021-09-23 11:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc902071134e91239592929214e8ec22 SHA-1: bd54f545bc30db61e294332b0d032100042dc9a6 SHA-256: 85a21d1d321054e6a2b6f9438d1741455d11e8b0868b98e134ceadbdd897aece
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. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, characteristic of a link farm used for phishing or malware distribution. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6111

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://jsdarvin.com/files/30814735633.pdf In PDF document text
    • http://gidaero.com/upload/fckeditor/file/tezesapifobinebafufa.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/20553684469.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614738d403346---luvuguminu.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210904232655.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/7530341239.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/5164958842.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/24939694747.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/p6eimqpb88l72edg6cdjt4v7vo/98570640280.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/67100681511.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/rewuvurotopekaxan.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/dudigubutukizu.pdfIn PDF document text
    • http://flirdining.com/uploads/files/netanasotu.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/88248330260.pdfIn PDF document text
    • http://csc-027.com/userfiles/file/20210921171457_277t9x.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/94664711467.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614306f0f029b---gibinipupoz.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/gorukole.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/megodu.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/20997615856148541629975.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/65039707355.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/75145519481.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6211ca01---ferugosuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=reduce+pdf+size+apkPDF 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_off00010b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 18700 bytes
SHA-256: 02369ad3d721fb455f593c6067ee2cad3a226322b7277255642644f1f27eb67d

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