Malicious PDF — malware analysis report

Static analysis result for SHA-256 728b1093af856ff6…

MALICIOUS

PDF

70.2 KB Created: 2021-09-23 03:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27587b1cd7f28a7e94ec0405026b5160 SHA-1: e89b4f981f5fee732d505be292a7a4ea3c49a4aa SHA-256: 728b1093af856ff6e9a1660e20ba18508a51b40295e58655f3729a06e7766ab7
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised 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 presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6717

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 https://laborke.ru/uplcv?utm_term=pokemon+go+geo+spoofing
    • https://bahamianbrewery.com/ckfinder/userfiles/files/mugerotetotozuv.pdf
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/tizula.pdf
    • https://tatsolarlight.com/uploads/files/42708957238.pdf
    • http://tythb.com/uploadfile/files/64739028160.pdf
    • http://apsons.eu/files/file/23027399620.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7332150ff55db7a7aa04bc9fe28f5325/89237525696.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/xupuwiwada.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353afbbcb71---71760198661.pdf
    • http://stefani.cz/fck/file/5862612719.pdf
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/89899691790.pdf
    • http://canadianrockies.info/files/file/91041093407.pdf
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/tadopinodopovaneluxofita.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9d199aaf---7864839099.pdf
    • http://bobmeetin.com/media/galleries/files/98816520702.pdf
    • http://toyotarent.hk/FileData/ckfinder/files/20210909_E0241CD19532DC84.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/48678debbccc3074415cd1dcef344c64/91380389013.pdf
    • http://coolscape.info/images/files/18700698025.pdf
    • http://nepalbestcargo.com/userfiles/file/56799351502.pdf
    • http://evevoyance.fr/adh/.-/file/45642499924.pdf
    • http://omonetach.pl/foto/ilustracje/file/tinadujemorilokijafudugis.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161449dcfc5807---26067565865.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/88939976265.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ef1459dc512293adfe67449542b4ed74/kijatedidusepaw.pdf
    • http://csc020.com/userfiles/file/20210916001645_jur4m9.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010081.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 16792 bytes

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