Malicious PDF — malware analysis report

Static analysis result for SHA-256 2417a518860ef7a3…

MALICIOUS

PDF

80.1 KB Created: 2021-09-02 11:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d3a90e3406deb8952f590c57e06c0e56 SHA-1: 650fa36ca9ce645d27d68b602db1782ba8967bea SHA-256: 2417a518860ef7a3f392243dc77b8dc4f78c7317455eb9259e5e994d2ece4172
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that leverage embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/dd5cdc295436d67426cf57d30e323730/50311113430.pdf In PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bd113eae8---77216948976.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0428825001629256748.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6k9msk1nmt2fan0l9a6kk0r237/zobawomapodifebib.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/41291165597.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/66635480285.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d83bf800cb365d20534596dc430fb2ee/gelowenawulikig.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/saviwiririnuk.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/riduxikesojofan.pdfIn PDF document text
    • http://abnicum.com/files/file/2524739630.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/13279012554.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/90941149360.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607432ca29d84---pufanisuj.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7696a7b9c---61261622187.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/dinojufedekapoxut.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/8200029020.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608174ef1b08c---94217544928.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74a8ee7c9e---8412655061.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/fuxuxomariluvupagopo.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc1ec3b3ba---tixajuduxuzuzugemig.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/dujegavokiwaf.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/suzedegotafogijafamu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bcb550897---43153732961.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/tuninazivowoj.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/95858478674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=buku+mekanika+teknik+sipil+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_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 16380 bytes
SHA-256: 8637e0ab30903fad11c221c281d0bf0eed982aa9adaf1d99321cc4f25717f8f9
font_01_sfnt_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 10684 bytes
SHA-256: 40de81e0c88caa38e63d896818e63f4b22897ffc257c55730a8164a6b3c73c80
font_02_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1