Malicious PDF — malware analysis report

Static analysis result for SHA-256 6904b59cb6c20d2e…

MALICIOUS

PDF

86.7 KB Created: 2021-07-02 01:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 92bc1a14a461e139a0e9dbd3e080e346 SHA-1: d7a3597f779810798fd634e2ecc067f5a6830e68 SHA-256: 6904b59cb6c20d2e83378ffe4a2dd44560cf4d708ebf7913c70628e83a323769
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to phishing sites or download further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://synerhu.ru/uplcv?utm_term=halloween+at+the+zoo+2020 PDF link annotation
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/9u5qq52f8nohs3fgak20ahnom3/39041198703.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/0l6qgvtdu2artnu1giet990uuu/xujepalumosutufakuk.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609438cd3f0ec---29224460207.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/62261835016.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/52555551751.pdfIn PDF document text
    • https://areicon.com/images/file/paxiwisifu.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/78880643592.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/40213582880.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f3961323e---zejugemotekaw.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c151d011366---3942092917.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d4484a8e5---nopirifusitu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a370ea85324---xivifiwugidomazitubuduxu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/661779a862fdc56dbd3c267d38620e93/45775924074.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc65f3dbc39---lojenifivepozemewiz.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/47547519859.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797523d392b---jenomafinari.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/1c19a5f106081452c3b92dc0e5f009c6/tatotonorinepapupaz.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891282483a7---nawipuromovexategi.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/11041942371.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f9e45583b---63329538474.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608543beafcfb---godajemoxonobufadir.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/22259684096.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/62417950757.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b8ea9454b33e2a1e42f3cf95ed85aa77/pawelexufumikizewomerapu.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_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 10224 bytes
SHA-256: e7f617cb4bfd9d03aeaacc9b97d5a9909daa476069982fb3a373ad31190ee171
font_01_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 17180 bytes
SHA-256: cae61f3b16a644aaf9936cee4f49fde3105bd2fd7c59149b3c0eacfce671404f
font_02_sfnt_off00013587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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