Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbfa1ad8ba27b2c…

MALICIOUS

PDF

86.8 KB Created: 2021-07-03 12:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9d1c1d7917b8167e83164b219644cf98 SHA-1: 0d7ee8581371d6b8626f0a0ad31fb571d389d94a SHA-256: 9dbfa1ad8ba27b2c5b4ac123056557ae35f281144b8abc55e7d6a8c7820acd85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites. The heuristic 'SE_URGENCY_LURE' suggests the document may contain language intended to create a sense of urgency, encouraging the user to click these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://ketchas.ru/uplcv?utm_term=numbers+not+to+call+scary PDF link annotation
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948deb2f7ee---59511237511.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a11be274e2---nupisopurijutanaju.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/148f8eedc42da54e25ac01d73ac634e7/soxepifizixuzosapabas.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/1d1e78bbbd22249d85f0a988bf4af172/wijibenudigo.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a48c056a---popazu.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/00538c80565b69ecf23978dcc9fd448a/30230050438.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ba045f540---5736422009.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/85608566250.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070895b8c6fb---kinobotin.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ce476a550c357263741d1c788aadb49e/borolu.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/jujosa.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/59678725117.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/246af5883d2a06b3d465618c3aab630d/70760955694.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d078db75e5e---82637176134.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/6256199431.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba467188924---tugipesawo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9235a51d10940ca534ae77bcf72576c3/ladozupipigibekipumok.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/78185403162.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/reduluwod.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/14120188888.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/96576403368.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/64440043833.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/finevumanadezapinat.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/lasotajiwadejedu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609844f0072db---nemusesunijowata.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160759c97ef899---tomotagofijaluzupezumaper.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/58ed9d1af197c4e83bf8d8ba2db7d0cb/bofab.pdfIn PDF document text
    • 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_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 17732 bytes
SHA-256: fef077801345e03d682bfc0e03d6a8138fc75a35d9b4a6ffa39246447074e159
font_01_sfnt_off00011d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D46 10632 bytes
SHA-256: 57c1a27cdd45e43f46fcc74f98ca9a5561b41d5b493da234e5a84e0f5d5b4945
font_02_sfnt_off000135ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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