Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18d294e86659505…

MALICIOUS

PDF

89.6 KB Created: 2021-08-08 11:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6387ed87744f1adbbc68e29710fdcb2 SHA-1: ab164f498d2102b991e5d5b87e15dd083a4859a5 SHA-256: e18d294e866595055b78b4656ec237c4bbcbc7f1a0c713e0818672f8f647f312
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7ae938175---vojisugi.pdf In PDF document text
    • https://perfecthospitals.org/FCKeditor/file/bidowifipawelotulo.pdfIn PDF document text
    • http://446888.top/userfiles/file/59093699333.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/dusaworemagifos.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/46215d6fee907c6c0ced996f3519c3b2/36338600652.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/grr3hq0o5qki1rklvfj165kvq3/zugikezenibu.pdfIn PDF document text
    • http://jiab.net/userData/board/file/5642414129.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/db5b6b21f558ffde89fd69b009f5cb6a/48567346777.pdfIn PDF document text
    • http://cke.hk/userfiles/92159644962.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadc69fb31---wuzubavojojivosebewarakaf.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/94750941648.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/n1nkpsdtbk2t24q87qn635vj00/49053957361.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/eae48410eea235274fa68ca1a0ff258e/16667096355.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/8161645805.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091898d7df78---18184191319.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/26897363646.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/93786779957.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/3rhqk8vuvjv1v87jgttd0rop32/vawikoz.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/0la086pjsufd0kribrfqmrf5op/92509557201.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/xufoxajuwaj.pdfIn PDF document text
    • https://basisnomor.com/contents//files/lilezasuliwotijobonu.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210619223707.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160908785885be---84523784949.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/eff6093efe4e96d86944dd5d1a8cdd52/67187037433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+a+whole+and+half+step+in+musicPDF 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_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 10964 bytes
SHA-256: fbecf6e2d14d31101d2bfddfafa5dc7d33d281671879b258304a4708cdedef52
font_01_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EB 17760 bytes
SHA-256: 999ece68f577eaf73bbd8eca6043f6432ef77ce3b3db52e5fafd80dcf10cf737