Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1eed686dab472d…

MALICIOUS

PDF

83.5 KB Created: 2021-08-19 15:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23c5029acef4ad203d351feaf142ea10 SHA-1: 0185fec378e6d24e94395a28e103197d2b03a150 SHA-256: 6f1eed686dab472d22627142ac752088067ab0efc083782138fc6e0b684a7677
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'link farm' heuristic indicate a strong intent to redirect the user to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://uralteplostroy.ru/content/file/23417415728.pdf In PDF document text
    • http://architettogherardi.eu/userfiles/files/60198432621.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/26071089980.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/74859717827.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/e94dbbd9047d378b82f0ae9737ee7719/sarusexopimarozisosakam.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/bf6uqgf3cavhvc0vfm1qci2jd5/zuson.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a244d13b7c---lamavaturukojaforofari.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c000bc07443---438037786.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/xanozusizaradojanof.pdfIn PDF document text
    • http://ropesadventure.com/d/files/lusipupowolosanolaf.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/21587828970.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/34010293024.pdfIn PDF document text
    • https://mytopics.it/uploads/file/dafawori.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16083ce3e7af73---30238764698.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160779b411d126---muwukuretuzutogidifazemu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da4dbcd4a8---jabogamitilebigama.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d07a8d7fc---68436479593.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/29707964386.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/nofaze.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/68844250040.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/fe8e07a06768f4dbe0ff57b552639f27/puzogukinatobogewe.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/1395923466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=windows+7+startup+sound+free+downloadPDF 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_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 10720 bytes
SHA-256: 40bb417ea0395483ac33ee25417255f99571a3a0d27391e02ed740708b0b7538
font_01_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 16400 bytes
SHA-256: f7677bf250e9a34db7ef667be21ecccd6857837949f9f3aa81b9724fe9345185
font_02_sfnt_off0001276d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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