Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf27f8c02569bdd…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 14:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1f149a8e7d99c1bf2208cc1c3458d109 SHA-1: fcbd40b5f3a2bcd7009fbad701ae86f4e6b1c8ff SHA-256: dcf27f8c02569bdd78ba683c669bbf915e2fc704154334639c596ade0654670f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of a link farm on compromised infrastructure suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8049c3b2fc---71431878221.pdf In PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/30717449382.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/80820718723.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/patubexaliboxikedagekamez.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8701f0b17---78254591458.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/rapuxolibij.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/912204994.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/vofakujaga.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/42120366176.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/wofesojodadera.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cf4559846---58453660020.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/86lqklpkif043an9pmiadkj032/bekiv.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/zowomiwa.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/58293608713.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc02275e106---xibat.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/mudajosunixagolosubis.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/fee6b902c2bf101902df6c2d209e65e8/97159424277.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/gn43ofjpkvk8qepu5dmr35v4l2/fisijimidako.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611411c13af30---xabofarib.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ee18a3deeaa5888e79d1302c20cc75f9/rijadutamowiwogatagesaj.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/ributawiviveluvapuzub.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/41624131275.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833caa23665---72562700101.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dba3e8508a---pawerapikezip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=payment+of+gratuity+act+1972+pdf+with+latest+amendmentsPDF 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_off0000d47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47F 16012 bytes
SHA-256: 6f00020d81c53e47ecfb9285591bc2e07ec838fefe21307df7ee8dc9da77f920
font_01_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 11760 bytes
SHA-256: 8d842b71a6aa77941927542579f0ea3335b2b091a9ff27b15b52f9c465728920