Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5a197199df3cde…

MALICIOUS

PDF

75.3 KB Created: 2021-09-05 10:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1053ff68bdbb5c656dc380c3ef216fe SHA-1: 261175b29d0e96ef245473e57f91e41b4cea02b9 SHA-256: cf5a197199df3cdead707329cc5a0b25d1c408981a1497968aeb04df0dce2dd1
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to distribute phishing content or malware. The embedded URLs, such as http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b9dd5350f---99103815657.pdf, are likely entry points for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://askort.pl/Upload/file/49058708577.pdf In PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/rogibemolukoxejulisibunep.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/48627810831.pdfIn PDF document text
    • http://faradbox.pl/files/file/riwul.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/33746638822.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/skm7uv5ed1nld9jveeu2ku4lc2/45057310822.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/54622925919.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b9dd5350f---99103815657.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/65796703631.pdfIn PDF document text
    • https://tckontrola.hr/files/miwajeniregopa.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160838b0811f3a---39032532725.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/tibijojudegubaru.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/5c0ff0ca4f135c54079402ad60b883a1/27247145801.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/jorifatej.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160985228e4e91---latozobowabowujunaxaw.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/94212186022.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/40670249647.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/wajagakegiduxa.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/jphft758pau24h9bkptjq1nobv/girabusogovapin.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64695291602.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/70487860745.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/50810592617.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/pavulotemadowajoxi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bf4fc46b8---nogexasirowibitibanozu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e86ab925f---valomeju.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/vopubudeketajojogedirak.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9923db278f---xebevazujopaxikimuleda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=libro+espiritista+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CB 17744 bytes
SHA-256: 8c432dd0a567509c2698b9eaf7e8a7fff0df86f909f47c05b8ea19194b222ff2
font_01_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 10440 bytes
SHA-256: 0d98804171f155687a9ddf56d4b744ebac14c7973bbeae3bdf358c5c67f6cc1c

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