Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c4af97980131b1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 22:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f6bde860c107a2699ce04f8978fba83 SHA-1: 0e351ce170c952244383eb860686f611c1c59761 SHA-256: d8c4af97980131b17ddf10932888f91e681c9e193d33d68287fec234391c9074
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://phoenixturkey.com/upload/ckfinder/files/gatedugowagiv.pdf In PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/70737341739.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608cabf3316fb---22830640794.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/fopagojikeponinesum.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9c9f324a184d260a35a4e4b61d754d4c/86223977127.pdfIn PDF document text
    • http://nfc.soo.jp/file/48784763175.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cecfdce9b---padedurirunuderuzupilodit.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9736f768f1---fedixuvof.pdfIn PDF document text
    • http://tencanpowder.com/d/files/55293026498.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feae206b79---94098801596.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/zikoloki.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/puxugakoju.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44b7c584c3---96337279360.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b9cd1e28e---wizoti.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/87093367380.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/59e40fisgpj1ust44c5ukhro4u/jinabalelewoxutemu.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/35720bae30f64aefa8b003dde04e7eb9/12943490133.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100dacfcb30f---7392644383.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/62374517225.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/lapejijuwux.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/82527723476.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/22986232998.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/97552a7e3c0dd4ef2734b544f52afdd7/masoxomimor.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607846cc458df---kuvuduzakanatozedujadawin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=arnold+palmer+hospital+case+study+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_off0000de8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8A 11080 bytes
SHA-256: 6dbca650067597c8846e5ea1dfe54573da2fafa40ae28cc785791c7ce23c630d
font_01_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 17564 bytes
SHA-256: 6a79fae6581676c0e831fb7e1b4a28f9a5c20d9c5e2055c0e46afa5bb27fbfa3

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