Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cf551060ddfb5b…

MALICIOUS

PDF

71.9 KB Created: 2021-09-04 04:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45d1708bd536cbe2b832e01bc7c24733 SHA-1: b4299435a652f7d36bae2f1d6c317ab6592126db SHA-256: 66cf551060ddfb5b78c88791d4e1ed1f6c1ff58168f58356502991736e845fb3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The presence of numerous links pointing to compromised WordPress upload directories and disposable hosting suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607427b7e2873---jedikaz.pdf In PDF document text
    • http://regmac.net/userfiles/files/87194803022.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160711b2839c31---bivemilirobil.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c93081e4d8---72239836282.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f9a947ab0094d1db506f5484a0a97e61/8109372401.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ugmojprggguame7plukbl18pdd/87969453428.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d43b500d2---94321421418.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/55296901975.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/79882710053.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/sizugokemolubiraluvunaf.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4c0iulgmjou0te83h1s6g367d3/zezoka.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/noxasakexabifosezidojex.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/2c1195f0c6d1dbdf18ca156156fefdb8/96304418017.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/sogetapepifemuz.pdfIn PDF document text
    • http://pinxedien.net/upload/files/tukijomevuto.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/99554497919.pdfIn PDF document text
    • https://mbbs.hr/files/depomomudowis.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbe38958e2---polonewewurik.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/lukawaxugir.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d72a9b6b---98814042681.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/17bj1krd5iq3iodpg8198eua71/33612971010.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/20493943992.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ca1ae97c4---wapuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=poverty+alleviation+definition+pdfPDF 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_off0000b733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB733 10504 bytes
SHA-256: 3eab3a3b4ab758a3359abb9391c9f36dd79b2c5fdc2afce9c85b1d182e336f0c
font_01_sfnt_off0000cf38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 16448 bytes
SHA-256: dfd1fb9eacd631bd803ecdf10da298eb3b16cf63bfe635a0fecafef7abb645fc

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