Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cc6970b80337cb…

MALICIOUS

PDF

77.1 KB Created: 2021-09-14 13:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 04b848fdb8e74cef799fcd6a7da6629d SHA-1: b3aa1b563eac09e934331773c0c45ad61762dc85 SHA-256: 10cc6970b80337cb7f8c741ee286faa3fb3d00c241f45d44b75a797186d8b6e5
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 compromised or disposable hosting domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://jualumnitoronto.com/editor/uploadfiles/wujafadubuxak.pdf In PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a6bfafc3ab1f3d6d90e4431a81a74c32/rotetuxojofi.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/53981781645.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/96305663510.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/40202193995.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/zigeduke.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/nezatinanijiniguteg.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/51020855709.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/mavojegak.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/xerewimuviloponube.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/23556212192.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/wetaxutufafi.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/98047550072.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5ded389ae---dajajojuvuxixasujose.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/8c0c71f97b1ae9d4ce511a5efd28ba42/5942890999.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/petovibizos.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/61603460243.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/86114614397.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/selupeg.pdfIn PDF document text
    • http://ciela13.leaddeehub.com/userfiles/files/930654699.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/zanawojazufoxijuvowuzi.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/walisenepepanojataxow.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210907_C9FD495035148D5F.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/28537454405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dude+theft+wars+multiplayer+apkPDF 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_off0000ca14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 16692 bytes
SHA-256: 0017e79853ffacb118947e145a6789cc9eee33d6f9b3a851fc5b993044451d2b
font_02_sfnt_off00010d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 10932 bytes
SHA-256: cb45e82bd4124c859733d175f3fd84ebe9502ec2952455ed86c2880c9aa22c26