Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1831537725e2d8…

MALICIOUS

PDF

209.0 KB Created: 2021-08-11 14:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee41da2c4b29cf76a71c1d92152d96e4 SHA-1: dd45eb1e6e5c88dd9779f0dcaee1a7a1b1e81c1d SHA-256: af1831537725e2d8803147ba3a0845a7af0ae5b3b0f346328c7fa8b19d1a38cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8961

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=advance+mobile+repairing+book+pdf+free+download PDF link annotation
    • https://mccartha-cobb.com/userfiles/files/72426191982.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/36327051053.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/39322984085.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb7602a66---zewupijepejimazibapo.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f717e10a0c---bexodabazasodo.pdfIn PDF document text
    • http://charlotteellisscholarship.com/clients/a/a5/a56794a54ce3a7e2a8fdc514f00cf952/File/jibeno.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f96c2b250---jewedokanosemigibalizi.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/ruwogoxupomaruxewadesa.pdfIn PDF document text
    • http://srhs1980.com/clients/877094/File/jilopogisif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b158d5a44---nelasuxik.pdfIn PDF document text
    • https://ptogel2.com/contents//files/88523109852.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/10515557235.pdfIn PDF document text
    • https://medtek.vn/storage/file/37378939699.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/duros.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/16cc4885e20920fb0e873bfabfc232d4/suwulunes.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb65993d1e---14682086037.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/78742510945.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/disazobepizek.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/3109038800.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c14baa2fbe---xuzagerexilik.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/nipev.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/vuzovovetugatometinufop.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_off0002c97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C97F 11064 bytes
SHA-256: 89c51320a902a5d3bbedc16bc64b504b2b632100ecf0bf6f74f375209a8c4533
font_01_sfnt_off0002e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E2D7 22704 bytes
SHA-256: cc17e6a65f64ddd2f418bab22c27e88827526e64101608bed150cb74571dc5fb
font_02_sfnt_off00031c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1