Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28ed07e5dc7a975…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 13:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0cf809d84341d54f7dfd39fe186f3f5b SHA-1: 3f507bc1a16fd2b9750fc8067b2d428b9b0ba786 SHA-256: d28ed07e5dc7a975f60ce6470e952486c8289827acf07630125c8c8b33d1c253
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://leo.tw/upload/ckeditor/files/busoworimalupemalitek.pdf In PDF document text
    • http://charontrade.hu/data/file/fekuvapod.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/517e4e20bba18f165fa7273cfbac3a6d/83592232122.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/30471958363.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/12102287546.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/97683560988.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/gawuzowogavojajokogeduwe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9cd100840.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/63236058239.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/28162013593.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607561abc59ae---31072843360.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109021101083958.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2daf7f3047---givomoluzezedezupotexatuw.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dedf224df---95220804341.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/goniwes.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/8b723fdd440a7a47e10d6a1c1bca48e3/8894593778.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df3e724dcf---21275084522.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607670785c0c6---moberi.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/48698761432.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/68438119744.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba21312d5f1---9006046066.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/54427109848.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/1spuoqn0rc5jv3mi7q1d5agoap/3766858780.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c325c0744---76517600731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=quimica+inorganica+atkins+pdf+portuguesPDF 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_off0000d28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 11168 bytes
SHA-256: 68ca3d0fb4e5b42e0f69ce98335ef7d6b289cd4a99a50879b2d522791445905b
font_01_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 20132 bytes
SHA-256: 13337da5a66e053e9911975d78904e4add598a869a78fd8b915e5c0994d29a10
font_02_sfnt_off000121ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1