Malicious PDF — malware analysis report

Static analysis result for SHA-256 e109ae2c08ee8b67…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 03:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e0141a8b89c56b8a15cd5d275fbe668f SHA-1: 7141479a3a878b866a247c8a8ca4ba26a09315f2 SHA-256: e109ae2c08ee8b67b8a7b4af43a91dc343ae4f8eff56a1c22059c7f5d4ef1274
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zkmeiqi.com/admin/ckfinder/upfile/files/nusepinuku.pdf In PDF document text
    • http://discus-rus.ru/upl/file/tupesagirufudoju.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/87641970713.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57512175799.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16132fa5458e9b---32861943612.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/44486544241.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/4506716264.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/66608021094.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210909034816687.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/euh18t89dcsp7irnl9ncr44nl8/65315332866.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/gubegegemoxejowefegilo.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614467db6e737---wurasaboseposudofudodux.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/joluxuxilinuwowezefoza.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/foginuk.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0e85a7c0f---55367441630.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210903205939.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/zopibomakigifekijowupega.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/nutoratunobenotovoba.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/kogedexiwisozeduvavulexa.pdfIn PDF document text
    • http://vucert.vn/uploads/files/fakujibotigixipunisitiri.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/soborapuxixu.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/nekiviwaboz.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/zuvirolavirizakimodivofed.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/xabiresevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=incredibox+apk+download+freePDF 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_off0000b062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB062 14788 bytes
SHA-256: 1c0e7e29a1110873f482862750b06e184444627b8a2f4b71e4e96c7e9d8dfc53
font_01_sfnt_off0000d57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 10720 bytes
SHA-256: d047722e111a49c9083e6846241cf1cf3e124fbb585909c762799fd0eb5bf286