Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fbcff185d8e50a…

MALICIOUS

PDF

114.8 KB Created: 2021-07-05 08:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 8359c70a0ed281d1b4f2a3dfcf279d5d SHA-1: 31d1ce38256dd78b0a9d764ed36199b76f0673ab SHA-256: 23fbcff185d8e50a0f6c77861e280a0890849bdc59027c2c48d435caaa2b15ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic findings of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM confirm the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chcial.ru/uplcv?utm_term=which+planets+are+visible+in+the+sky+tonight PDF link annotation
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/99041111676.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1b2ab60c1012fc18c4309ccd610f4c0f/xibubego.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/japuzixevanifipib.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/11b4f3e1e94127d74104acd9db62bd0f/xowurifefute.pdfIn PDF document text
    • http://recrute.fr/files/files/76817479918.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa7a7174bd---kalumamunizudex.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/0b10129560fb181d84a2030f855d0c54/raxibudexukinozizex.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/megijidojeporimoli.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baba8c3c2a4---pazive.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6afffba0dac594d24374f21cbf990f5a/43776620620.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/vg874sa68to99ifoehimlge7br/konovebitigadixegig.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095a0070b2b7---91930989737.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/pewinakidolekiwilone.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/6a54352d3cba4909f1217665d4a2ac7f/35886590640.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7cc4c6fce223c48d27bf53ab185a9078/75845102913.pdfIn PDF document text
    • http://homeopathyhk.com/files/8366534797.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f1090aa5e497d13cf54feb973f40ecc/29946527276.pdfIn PDF document text
    • https://kildevangen.dk/files/varuxofodezokogasoxej.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/21205304743.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/d55fsb9f3714t0js6vlid1lih5/tekodozazatugegako.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5bc76d1db5b6285417aafcc096f47d3a/94344944711.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/sfaaumvnmtlva6eq2h96hltldb/65602684633.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9e139b318---zefiv.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_off00015db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB1 11060 bytes
SHA-256: bd57836691fa635d6ff19e51b1f6c2fc9e8982a37605c5f72ca56c38c41da96b
font_01_sfnt_off00017744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17744 17620 bytes
SHA-256: fce1547721b39f7138da340434041a3c8c92b84da644f70a18616a8672fb2531
font_02_sfnt_off0001a563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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