Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4db193a92824095…

MALICIOUS

PDF

65.1 KB Created: 2021-07-18 20:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4e89780222dff2c3fbd34705405642f SHA-1: 46e4aee440c02179fd7e13d9f281447aa15e8a9d SHA-256: d4db193a928240955641d36e9f85456b4d3990dd5548fc40bd4cd09dcda3618a
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or scam lure. The 'utm_term_redirector' heuristic indicates a potential SEO manipulation tactic to drive traffic to these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5526

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://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609c875d1fcb2---42926645445.pdf In PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/80f921425a1f9584253f8e0f7188c46b/jadawobujegar.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608654da978fb---miwikiwosuluxa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160714aa229ba3---rewofisakox.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/32267610767.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/refagubedujokuganu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffbbe0a911---sezipobulabinu.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/12219376232.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lijivojopifu.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/8265d20ffb61af25c30ed05c66ad49a1/bevunabanepeferuwidawaze.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf06a0bc1---xewizaverifelatusudo.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/f9s6m06f5275rtpkno4gh184q7/xekudubusisus.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094a37279578---39179102547.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/3890326640.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/59876939204.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d94f6254727---47585286194.pdfIn PDF document text
    • https://flyags.com/editorResources/file///50115694173.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/47343864532.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/negujegupira.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/b970815fa8a1a8b9a79d8b100235e1f7/bogula.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/5cba71ea15db004768917688d7ef85ad/gobukikewogipafi.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767d0d468a2---49361935802.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/burafogizijif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cell+membrane+drawing+labeledPDF link annotation

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