Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d9b552fe908c84…

MALICIOUS

PDF

110.1 KB Created: 2021-08-09 02:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 1ab95583205fe7a04d2c6c1fe48476e3 SHA-1: e06dc7202a8929f334233c8107078a31f4e7a854 SHA-256: c8d9b552fe908c84ef240bf7d175f834099a75b8eb2a56849c6bd844aae5c3d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5fcc9b165---20202511135.pdf In PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb609db5b4---48158293150.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/juretafowajodadewode.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/405bcbd4050074724ac4b8d59834ca31/24598371389.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/nogow.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f275277a99---35136235286.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/88718691947.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/82110550938.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/somokapepafed.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/62615848559.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/32e3fbf463ebcb215a2b1e9feddea968/zexeke.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2q8i1b0vq1r90bgjiar93b2ibb/70729981823.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/55886166944.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/30583570536.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/11238577639.pdfIn PDF document text
    • http://ahchala.com/img/file/26800313761.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/38911232017.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083024ce669c---88587100543.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1609c24d88c57f---tiritugofadizoriv.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaa9422074---8522213351.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/38ed5195bd2c9452ba84e7c4881c7ab9/83581818138.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/xuvotopojegawax.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/nilik.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/66246789550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=route+66+travel+through+the+bible+answer+keyPDF 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_off000148b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B9 11196 bytes
SHA-256: 2d673807f267af5e95b68c966562f39a324990847d2a922238cc4c84d3b212ef
font_01_sfnt_off00016301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16301 17396 bytes
SHA-256: b53d267b2e2b94bdf67c8c239fec8d85dad438ab9048df907011b1e556d667c5
font_02_sfnt_off00019093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1