Malicious PDF — malware analysis report

Static analysis result for SHA-256 88227f59850e47f5…

MALICIOUS

PDF

69.3 KB Created: 2021-07-18 22:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 584fbf601e64026d73265c94bb4e404d SHA-1: b87dbeeab0f2772095564c9def60306dc1af766d SHA-256: 88227f59850e47f5603fad88c93edaf526792ef53ab03edae1765bec1b0e7e52
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7775

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/1769695afd0a89780fd4635fc530b651/gotivu.pdf In PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fbdd12244---82088480385.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071d969c1e3a---muvozebolukud.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4ca7f1a26---55843066842.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/80463152746.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/90072276160.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d982116e28---nejebavibitikinu.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eb69be59a---80061860856.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/zexomokevoganafewumon.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/70459617061.pdfIn PDF document text
    • http://stevis.cz/files/file/felinanada.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a90f5c58e8f---88813669220.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e8b7157fe---zejewititepapupopaxewa.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/60949516813.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb048188b---77376717974.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/60841136730.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/kololudoj.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/wutusadabavogomote.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812b227c305---43237772150.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf2d6a1746---19506971346.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/76204483174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=java+more+classes+in+one+filePDF 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_off0000df7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 17280 bytes
SHA-256: 01df5de9fca895b96c5f88299ac46df836faab1a8316d76bc576402228450864

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