Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e8fccbcdc188ec…

MALICIOUS

PDF

91.1 KB Created: 2021-09-02 13:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd87e0dbdaf4b1d20d9252906fefdd4f SHA-1: 433a8b89a63ec9d350bca4346a6b19d9f8d83537 SHA-256: 62e8fccbcdc188ec5a560406a89eba1ce578f77ab812a621406e09d5b0158fd0
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and compromised CMS upload storage suggests an attempt to obscure the final destination and leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oilbasaro.com/web/images/ckfinder/files/20210704144417.pdf In PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/dvj0ve6oerp2tepsh217lca8b4/nipowukubenavarudibugono.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/fexafotakibebe.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/guponolosumuwafazifi.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d8f1f6c7157c93dfe59444a059e857c5/vedobez.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc46221b27---rulobiripoze.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/uegs0juak04mtk0i092fv1np8i/55910832636.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/46402098459.pdfIn PDF document text
    • http://hkacca.com/userfiles/fupinesodimodovisulux.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/60034577937.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/5b09c1234c85f0ea151a9f54e23fe215/23345215517.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/moxawuwof.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94277bd93---soxofibisefatukuwevanowek.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/45329231232.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/12405133171.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9i6bok23jsvhve0nkvd8r555q5/totogiloverak.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c89f1e5a48---xujirapa.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd27aa5d26---muwolekunopil.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/47032636683.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/inhc5i5f5oa193pkasjjpkjesj/lamulitugabebulexugusemo.pdfIn PDF document text
    • https://stotex.rs/files/10134819456.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/s0pgu07ifv3vltqe6vml5r9mp9/paved.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/91be1930a0dbf7d4e25ef3c422912600/xidumepadufetirozezala.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b490ca6e3---98334529997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=coraline+graphic+novel+pdf+download+freePDF 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_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11503 10816 bytes
SHA-256: e6252b08aff32a8cc236eb902261627c40df7dd2e2377ceb31ff06862d45ce3e
font_02_sfnt_off00012db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB0 18636 bytes
SHA-256: 45006a521e761a64d4989165c21e5e4bb768d33fb7c94335502a3f51cb7877ca

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