Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ea2f3fcaae7a8e…

MALICIOUS

PDF

89.3 KB Created: 2021-07-13 11:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b93fb352e9968e1dced8fb806d798f87 SHA-1: aa4321d06b860d9b86bacbf67acfe62857a2df38 SHA-256: d9ea2f3fcaae7a8e10cdec8526bf8a05de94cbd843eb2d367c3509a5ce751414
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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=lo+wu+correctional+institution PDF link annotation
    • http://carszana.com/image/upload/File/zavenudiregawixokuv.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf124adcb---44901907394.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/edfbc3a6b235ded1d6d5e25b5fbd6402/toxilusamumifisuwadifil.pdfIn PDF document text
    • https://0900107678.com/upload/file/funaxom.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cfbda4b2c---10797862036.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078df37d588a---tixalapolomobidijiwow.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/71300014060.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/82738539157.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b253ef05086---55479094039.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/80155317255.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021713625204585.pdfIn PDF document text
    • http://sparkpro.lv/content/file/54269849922.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a18464a16e5---sinedideroza.pdfIn PDF document text
    • https://congnghethucpham24h.com/upload/files/palidato.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607042606ef02---26188445104.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/nenarekafuxusuti.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deb6bbd430d---lizuxabozebazilowamujatif.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/55667239789.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/ruvimoliwepitujemo.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/viwanasurawerifum.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/7c0ab7b54a39e845684f80c028b3e540/96396082541.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703051aafe0---31349841338.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/tn7aajvo2c1h7s1jtv6chnvnj0/31188722432.pdfIn PDF document text
    • http://geoman.cz/data/file/wixumuvotonozufifor.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 3052 bytes
SHA-256: 83dbd6cf3c2d93dd4b944cea20301cb03f48756f06bd01493ff9a454dbfa7dd7
font_01_sfnt_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 10364 bytes
SHA-256: 17c5ce4b0f4b49f64a7eba8f51cb90d955b5a2d22c9ecfd8a57afb8a298a0b60
font_02_sfnt_off0001117d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001298f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298F 17488 bytes
SHA-256: 2c57535499cb83becf51be23cd521ed3ebdcb867946a1b11f88a928007b7415b

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