Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b65cf553420269…

MALICIOUS

PDF

74.7 KB Created: 2021-08-02 17:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6b6568d2c410964053eb758c20b6ffd1 SHA-1: b8442bfbef5278feee9714fcc5a62c8fc99069d6 SHA-256: a8b65cf553420269e0ffa322d3cf394db970938bee38d952041fced7f57b0d12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://amghanoi.com/images/ckeditor/files/4940781350.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d19fd4e5a50e256b1cb6d7e71e43b93/69566627201.pdfIn PDF document text
    • https://topupdana.com/contents//files/45740600621.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/010vu89cehe89oseui2ki1atmd/suveru.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/74197177167.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/jelob.pdfIn PDF document text
    • http://minhanh.com/files/27117430765.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ut3044mnngen0kphvrfoqa0lf0/77346402414.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a62fddceef0---domojibumiwusezutiwamoj.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/zuwovezegefawaluvodi.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/fc3c702420b3b5523acc07631cbaff04/sugorixireredevumexe.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/loziba.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608332fdc119b---18574548911.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/120i59fsuvd45lhasqoobfhqo2/kebomapibowifiki.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/42490555073.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/77929518572.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/ca3c5bsoksbk6bi9csr0k96ch1/17499618100.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609de67e6fce8---zurosuwixurivobodetepor.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc33936f586---11687640677.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b3c4db110485bb4b85d64186bcceda63/najofarurotufar.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160791c8d99a80---75455757085.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/7863b8d75a83e4236f7c79ab40226d21/jikegijavore.pdfIn PDF document text
    • https://wrd13.com/force/file/18252818863.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160929816d2652---75165096009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=chicago+title+land+trust+company+websitePDF 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_off0000bf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF61 16644 bytes
SHA-256: f864da3ea3c781c41835cd0f4418393400045a006a10c3932b5f935444f6edee
font_01_sfnt_off0000eac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 11432 bytes
SHA-256: 3aec1238d6362691a76c2da76c2a593cadc9c9adf8f999ccca07c520913546c5