Malicious PDF — malware analysis report

Static analysis result for SHA-256 8955d4304d347801…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 03:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78a67f6c20ccf7047392b34f62f66b6d SHA-1: 61c02150714dd7425eb3232efb2506ddc9ab1db6 SHA-256: 8955d4304d34780192163d783dd0809fe89f68b4e625f3c70fa0bb021521bdb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://drafthe.ru/uplcv?utm_term=rituxan+hycela+package+insert+pdf PDF link annotation
    • http://artecgroupservices.com/imagenes/file/23221120328.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/xoseperekokamorasefifi.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/3e025d9c3fefe18211c2c028cb70fa82/daxukulogu.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/fizogotawevunujisuxafe.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a94dcc7e---15022461957.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/tazizofuxofixukiguj.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-28/20210428225648455530.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/44890744998.pdfIn PDF document text
    • https://anaksemut.com/contents/files/jizor.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/dunodunadipewulofijiz.pdfIn PDF document text
    • http://thongthien.vn/upload/files/jetatukaserof.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/pitudanitinegaduwuzukug.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5357210f79ed77d3b270c25ac6a16c9d/reketegabujazitegibala.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/rixasajirukoboduxizane.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/ruvegiboruzepotoji.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/51913463150.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/11156035794.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/rudek.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/likapave.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/39652124843.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/wubuvulimuzupubigorim.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/937948086.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078444c65eb7---julaj.pdfIn PDF document text
    • https://mfdesign.hu/files/file/12632418399.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a2543ad836654ce0d7ab390732aa110c/21843780569.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/07b8c2139f37fa903911018b65ba36e5/44300765527.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_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 11232 bytes
SHA-256: 921df2e20d6bcf41557995c3ddae7a53e29304858f280eaab8ecf8fb396927fb
font_02_sfnt_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 18420 bytes
SHA-256: 9e5fb8ac7df3b96f76997eb19c5dabf4c67bf054ace0a1f5abcc8f152ceb0aee

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