Malicious PDF — malware analysis report

Static analysis result for SHA-256 8770f35a2b61c7a1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 18:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c5661fd2d0afaed6fbfc6a578fb3105 SHA-1: 079ad25d22f4b70954478f5c2e7893a5f8d2dce5 SHA-256: 8770f35a2b61c7a1b5332df8d61efb490a8a9f5c27baa179cf01d8d89113c5ab
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF file was detected as a phishing lure, likely designed to harvest credentials or MFA tokens. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with credential harvesting tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/s1nbgt6h80ncekv8i3v1542c3c/wumumisemazixotuwolin.pdf In PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/oqcd7a25dkq1g4mnofa6r77bpf/gunugojavijukevuxomow.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/minanulo.pdfIn PDF document text
    • https://avela.md/userfiles/file/mosepatunelalevobuso.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/79089508903.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a892e2b71---pigitazugogima.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/gorofoxeruf.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609be50e7eb13---wokipejufifuvuket.pdfIn PDF document text
    • http://yepuco.com/uploads/files/medawiderapojujitur.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/88b3fd64b3ba2cf29c8dbac8421844af/buvonebibedibo.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/56920223901.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/41bb7f99f9abd1d81c95a18b94891e5b/riralamujinafowawa.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/00b871ff2f9fec5c92ad8338cfaf5d9a/94004518026.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/48768279350.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/kgu7acvg1ch0m968i19lrieu31/jujanibupotitajajimiboni.pdfIn PDF document text
    • http://elpijisystem.com/file/pijarajosowiwaf.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081224fbade5---lesaxop.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/74953773905.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/fikupagug.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/cdc04271c260f8a09ae0b057770b5540/gujojajudisefipin.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/bcafa3c16b4da585e9b4566ddd65345d/ramopixerizedizoturimoseb.pdfIn PDF document text
    • http://ceroki.com/image/files/sofodupegafekexiludupulu.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/dalufowamatun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=parasitologia+pdf+atlasPDF 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_off0000d9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 17940 bytes
SHA-256: 75f0df0948ca261a0285d63c6f9edc65e3ac068c839bbf1aa8ed38015cc3d902
font_02_sfnt_off000120d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D0 10440 bytes
SHA-256: 389e6c1b80ef9115d1e64e801cd0ae03d76a38c45aafdb76c761f6973819c004

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