Malicious PDF — malware analysis report

Static analysis result for SHA-256 b809b1491746ff1e…

MALICIOUS

PDF

122.7 KB Created: 2021-07-06 05:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bb5fade138b24797dd5e3e2e4a61b1e9 SHA-1: 4fa835e05ea5ef337746d93293327c9c8d31be2e SHA-256: b809b1491746ff1e2346af5a00d31fe8a04ca7f8ae1cf6c184c08026e4c34609
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting domains, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/4adb486366128aa235f8237b4649e93c/59890184267.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a872b5677c0---38169016578.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee534f7a9---10869902882.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-4/20210704171208155997.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607949f244913---vugakulotovomituguxu.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/kerubenumetebo.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/45794904131.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e0b7d82aff3aedddb91cc840bc02fb2a/45343689191.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/25977194361.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/satakirozupunejonasibu.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/2230439164.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/nivigudemarom.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/91986234465.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/39311267434.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6e5082fed1e0be4dca67dd7628c4da49/40935327607.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/67750962301.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810a53b9a52---75420971001.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/rarusulipodaw.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607807d06578c---19067022727.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/85103802057.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/8565eecfa0722fbe8ce0be27f54c3aa4/54098838482.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/gofovixovuj.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/25824811555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=1+cor+14+34+commentaryPDF 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_off0001819f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1819F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000199b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199B6 10404 bytes
SHA-256: 627703894cb1d727132a99c9609e5d24fe2df7befc2e7acc324d6222d626b3eb
font_02_sfnt_off0001b161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B161 17236 bytes
SHA-256: 2a049113afca33993b5103b98dbfcd666aef8b719551c610cebf0e4c9c2181c8

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