Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2bc6beac89471a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 23:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a25f6c1c5306090f2b74674548a380b7 SHA-1: 805ce422d411b1df0b952e8b6b4cc11d9964e87f SHA-256: 0b2bc6beac89471ae29459eb593b758f7a4fda52a5772b3bbb049bc9e7f00075
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/28ad1e02ed4b5333c556dad400b2d02d/ziwanaruno.pdf In PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/529cc265b56ece17bf668741db5d7816/90085627333.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/41305560028.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/44746025844.pdfIn PDF document text
    • http://land89.com/ckupload/files/48058116674.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/97111815593.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/nudino.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/82049613519.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/guteludesifoji.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/43107261798.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16133f92f7924d---gimavozijakexotor.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210901_010538.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/marenodof.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/ruviguduwo.pdfIn PDF document text
    • http://shesob.com/file/files/40488406430.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109051525455391.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/zezoz.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/edb03376560fc0408bb47db2945bde8d/23285479989.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/24817351660.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/29822384173.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/61357af010c5f.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/lemomofitezogudegav.pdfIn PDF document text
    • http://sbairs.com/datas/files/3945434137.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/27013065534.pdfIn PDF document text
    • https://tcremich.lu/files/files/38146841974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+camera+app+for+android+phonesPDF 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_off0000bf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3B 10892 bytes
SHA-256: 472aa282057c3ef0ee35874bc2ee9e86f46d90287025e611a2da216e1848eeea
font_01_sfnt_off0000d837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 17724 bytes
SHA-256: 4038bb15ed055378d3c4451e2b42991e862eac0fbb37e119184875f48dec2c96
font_02_sfnt_off00010621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1