Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b7703da7c344d8…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 22:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5632e0cefa673676c374b90b9f72e9a SHA-1: 19b1c8d324044cab91585ec7830411fed62f3e3f SHA-256: 19b7703da7c344d8dab1341ad1a4593ad0963e8780722e054ec7a253bd6c7324
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608172ea360a0---31049150981.pdf In PDF document text
    • http://limoride.net/gallery/file/58453667840.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/32135981241.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/serixokaxekanafumo.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/hvlpd4re15jaguvs2cluqoki8b/wibagusuxugijomawovofusus.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/magopokanufaso.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/58364288493.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160833db263193---zibuw.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/porusobeb.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fsvbum4gdb7f27jubpi9r5trs1/xezixumugiz.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/kibarunelakapefawenozin.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/44223752852.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/34597840541.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/fc964e066652b15f4e53243f227d18d5/golitopexutufi.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/63659807710.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25534121fb96edca1a073b58535c104b/najikuto.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/derefewoxiwajo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba35214bd---55759575371.pdfIn PDF document text
    • http://sam-global.ch/files/file/marexuzuzezufujokuw.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/werodad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=positioning+book+pdfPDF 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_off0000bc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC35 17304 bytes
SHA-256: 985cae66f965d7f9a6bab2e44eab1ce880c7fc05e33abad59dbe938616de552a
font_01_sfnt_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 10468 bytes
SHA-256: 43e27634d2d53c1b65010a957a2219656b896a4b024e30c48e9cdaaa423e1abd
font_02_sfnt_off0001003c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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