Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e4652fcc1ec809…

MALICIOUS

PDF

97.2 KB Created: 2021-09-01 18:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4cedf3d3fbc977d30d29c3b851a74529 SHA-1: 4ed2166c094852e12a89388ef3cdeece83a3b875 SHA-256: 49e4652fcc1ec80961fa56668ca5570096a33144bb48a83c5816d27c4f2ea78a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to sites hosting malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=the+upside+down+show+birthday+party PDF link annotation
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160786d15ce99b---kiwurad.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/97200396378.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e60db79a---7894105935.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56673633808.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/61069469123.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/fojezetadizixetedebebitu.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/risozuxama.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/a1a65b8488399a309e1486a65ba47c0f/15140527116.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/15272394416.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/75388858205.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607948765be0d---maginejasutodilopedokage.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7petf0qrfqjtpujpvop1eqk457/dezupetusogom.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/22522098095.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/75369650334.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210624084912.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021515233303875.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/74259682630.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/55515543526.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f51f5d43855---dalaxedafexatuw.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/18c62abc7d1996c0cfd04c423a571843/togez.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/80614358650.pdfIn PDF document text
    • http://netflor.pl/upload/File/31548648251.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_off0001176b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176B 10848 bytes
SHA-256: 0c764658841d8bf4573c992f5b18e3f14f42e79195dc6db3b4c8f848e5055ed7
font_01_sfnt_off00013045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13045 18120 bytes
SHA-256: 06296c48d9cf97e7af7c9be125ce45c39bd379e943eca94f9adbcd11a715a8ba
font_02_sfnt_off00015ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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