Malicious PDF — malware analysis report

Static analysis result for SHA-256 782e5dadb2b70709…

MALICIOUS

PDF

69.8 KB Created: 2021-09-06 09:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e5f387850f3678340f8e34ff64eef7f4 SHA-1: 92beb9425865ca9044ee89c219046092d85ecb9e SHA-256: 782e5dadb2b70709dd246a7e05cb9e95424717d5f22442d8f6f71f8b9a71b559
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://standdominica.org/files/files/38286113662.pdf In PDF document text
    • http://learnersdigest.org/userfiles/file/dosedapomopoliwibow.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/61355827780.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/47006610323.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/bipororijex.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/jiguvixedevixorelexag.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ad0d08708---6479622597.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/zafojevu.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/pumilufapugavasitow.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/32528971734.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd068fdbd84---52169587387.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2a5e024377647ba6fffd7d10729f89d2/pijelulexug.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/34mlsn5p47h6ftkrpht3i8pmo4/37652916683.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/galibowebipa.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609991e8b0239---90619955381.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/taxokaravafenigukop.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/jenazapowozigo.pdfIn PDF document text
    • https://wasael.com/userfiles/file/56135909380.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/tiraloz.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160818d2687b21---87471896004.pdfIn PDF document text
    • https://seikai.jp/free_images/files/38641964326.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/90399331816.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/26557860468.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/58756519389.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/64332144525.pdfIn PDF document text
    • http://wenxuezj.com/images/File/nugogetugiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=coso+enterprise+risk+management+2017+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_off0000b3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF8 11260 bytes
SHA-256: 2b51542b52de690650dc2e133a514e63e3d131730c0eb57e238097229f752b98
font_02_sfnt_off0000e658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 14352 bytes
SHA-256: 94877c78899fee3df3f04eb7028790be857b5abcd338a07ca960293b913960f6