Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd3bfe20c987d6d…

MALICIOUS

PDF

91.0 KB Created: 2021-08-08 03:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e58d255e2680074b96e37d63cb179e7f SHA-1: 4b8226145b4740f938fdef5e75eea357cd947880 SHA-256: 6cd3bfe20c987d6d62d6edad23b88840dc178fc12dd34841cc65d6c6602d555b
164 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to phish or distribute further malware. The presence of numerous links on disposable or compromised hosting, coupled with UTM parameters, suggests an attempt to obscure the final destination and potentially engage in SEO poisoning for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/7nlvgmdcs0n67g1k80ti8slls1/16314535377.pdf In PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/n96f463hmiomp8cecbocqbop9e/molufizitaranunomonad.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/rekotidukapafu.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f44b93eb35b0890a1452654a5878d50/38908435267.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/nigije.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/8df30d4891aa1c86c1a8c7fca1431490/mofodenufivodosuxid.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/zomitimexawilexiwepito.pdfIn PDF document text
    • https://puntoagricoltura.it/file/69037881304.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/96366174893.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa004060c7---bozirir.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/38318727483.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/66783885581.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/mf5032u7u5i200uk823j4b2d67/59985926440.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/501fe2e8a9570914823b5cb1cf65d1fc/6386518889.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f87b2f18736---xiguve.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/13e35104454692bccaf8fbfa9c3632b9/90364471513.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7cab424ed5712db41b9fe46810ece114/9045024844.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60c387a3bf74f.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/80991256194.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7373b4f708a0a498cc6b68a67d338772/rokiwadetumizivesukazevu.pdfIn PDF document text
    • https://successalpha.team/upload/files/monok.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/1df80c5206a900d6560896a36e9d644e/21526632361.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/60388560677.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/42248c63d1836b216b6aa07ffd1376bb/19287418100.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/79048317500.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/xizusaxiludesixato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sniper+3d+mod+apk+unlimited+money+and+gems+and+energy+iosPDF 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_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 11288 bytes
SHA-256: 2022c5013220687aa3d84c8ec210bc6077f27631bbdc37acc4222e49c1ee7b12
font_01_sfnt_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD1 19456 bytes
SHA-256: ab2bb1c8826ead9569ca0851256844b76f009cbda0eb379de77ce81768034058