Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d49c835d925830…

MALICIOUS

PDF

90.5 KB Created: 2021-09-11 14:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d75e47b12b334baddd842d5aaf38c71f SHA-1: 610bbce048688e4892be78e3cae2d4ddd4106b65 SHA-256: 85d49c835d9258304b409c265f707b8135230636445663277f6ca678efa31d31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://ketchas.ru/uplcv?utm_term=sky+royale+io PDF link annotation
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3ce6ba33---79787948072.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/54887928472.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/12288941694.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/ruralunigorupuwanax.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/xuxobevuvozekebeke.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137aa051c096---lotef.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/sotozewedopos.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/80022241205.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/11414438883.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/bapelubegofakufasilup.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///fonebesadubuximuponu.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/rapamin.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210909_1D7C19A594D12E2A.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613165bbf1aec---tafedawaga.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/78603456124.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/46203478846.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/68388869187.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/fivebimabewinufubaj.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/56978171536.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/68937261587.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/76784301502.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/xubipilevujifimaref.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/75325091117.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/3500347348.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109052153298610.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/jewikegixejunapoxapabufi.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_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A00 10012 bytes
SHA-256: 9e325ac4e8d5b76056f61ff4b7c69766d01aa167a45448334d21e8a99abb1288
font_02_sfnt_off00013054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13054 16868 bytes
SHA-256: 94d3ff59764a3069cb55d75e3c8a93b526646cbbf0e50d73d23ea2b7252547b1

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