Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6855cd4e22aad7a…

MALICIOUS

PDF

63.6 KB Created: 2021-09-15 09:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db2e09ab2df894bd6456675a00591b2b SHA-1: 67ad338799b2b34ec87b3f079739427220db5d6f SHA-256: c6855cd4e22aad7a72e35242ad4da7160632a632c4286716fca73c54581bac2d
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links suggests an attempt to obscure the ultimate destination or to increase the chances of a successful lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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://halanmilk.com/upload/files/79136054595.pdf In PDF document text
    • http://budka39.ru/files/kisumixabibe.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/84807297799.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pgsqdqnthiaonm2d28q794uhc0/lupuvukiga.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/59310473088.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/86241944678.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/bajufagukaxumibaxe.pdfIn PDF document text
    • https://ferropula.hr/files/63907491828.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/86e7f9dfe3fe77ad7d79593af38937cc/51211897715.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/roloripugojeni.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/5305700450.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/10324e0c39d54b980314fb1fed4f86fc/67096811255.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/33967393346.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/94755526879.pdfIn PDF document text
    • http://fteq.ru/files/file/wofopaxod.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37813642373.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/metetakasenokofojawejawal.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/60549471188.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109130936073367.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/waferevetapuj.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/damibezixubisemelepudubo.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/7364573306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=robotium+automated+testing+for+androidPDF 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_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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