Malicious PDF — malware analysis report

Static analysis result for SHA-256 9272d6aa9da475f9…

MALICIOUS

PDF

88.0 KB Created: 2021-07-26 04:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0661262da3d2f1b7644e16db0def3688 SHA-1: ad4d93453c72773aa3291b7d32456230b7fd4d1a SHA-256: 9272d6aa9da475f9e9229da72e50be52b98fc5ff83b934eafb6bad8e3c11ef26
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to lure users into phishing or malware downloads. No scripts were extracted, and the document body was unreadable binary data, suggesting the malicious functionality is solely contained within the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/75750426215.pdf In PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/634b4a2eb2d10dd7b9df2b9d7672be81/zalujemudoloxusumejez.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/88ab38c17c122129095322c7af4c1bdf/78635726179.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606efbb7a8610---wanojawufupanavajopus.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/nunaxugojekimepu.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/e4ff8a4b55117353846baa957f98e359/rapageraguz.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/33872461528.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/54541752144.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/82187558025.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e56b3592c82608fb38c369d42204665f/kutukupo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd86a11137---19219075291.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16090b304a08fe---bidilikiwaduroke.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/e8p0sjomoasa0ktpir4kemgg9c/fijekigebuduvavutut.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38cd8a65fc---32930845022.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b0c630c02---17981063769.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/bojukuwuronerukivo.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/r5tg4en086o1geoa7a0fthekrf/vekirumuberede.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609689366ae4e---banowu.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/b55666f3dae4dc70db1f25fc7e77e41d/79896983662.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ol4de0kgfi4p33nlhq58u5g4j4/godeja.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/91239116004.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/72952280067.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/nepopibagexuporomirufe.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/nedujozaki.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/kulune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bid+proposal+template+for+cleaning+servicesPDF 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_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 11080 bytes
SHA-256: 0deef6aef66033cf5a109a3cb7c04338e3f28518930f3622e8edfebc1a42422d
font_02_sfnt_off0001266a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266A 16596 bytes
SHA-256: dc77e41b8f66366537611cb605beb76e9dc5fb8f9c78425b1154e28c54dcad93

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