Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d114894feed1b8…

MALICIOUS

PDF

97.6 KB Created: 2021-09-15 09:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57a6a56a73c0097f27800f24b3308cbe SHA-1: ac7b88fa6ecfe565f5be68d6f4747c10b75435f5 SHA-256: c7d114894feed1b8dae60871fe5b278c937ed44376e585531a34c389c5232d1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting, likely intended to redirect users to phishing or malware download pages. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://archism.ru/uplcv?utm_term=bride+of+chucky+full+movie+123movies PDF link annotation
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/34612231042.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/83783520692.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/rojowowat.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/34608872476.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/31992731650.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d236eda7403a87befa1db3dc1ae9f19e/93805918403.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210913175133_697736927.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/79543565136.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/xurutokup.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e231117cc5---64632148691.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/31999288051.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-8/20210908163029368429.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/zomuzukarawuw.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161353ef26c073---88910767026.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/81101361159.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/90059254107.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/63046546308.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139300ed9a58---sosopalazofosajimara.pdfIn PDF document text
    • http://turnyras.lt/Files/file/tevagukanolatuvedeforuwi.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/53089164529.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141661c7979a---rasaxubelinuzozaxasuporem.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/96544197715.pdfIn PDF document text
    • 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_off0001161f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161F 18448 bytes
SHA-256: 80a28c6868a268ec829d0c8aeebc8a5e5cd39657a77cf26f0f4f2024c3ddc3b3
font_01_sfnt_off0001466f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E86 11144 bytes
SHA-256: 41953f8bbdc9db8f62f89c615d6ad1f3335df166a6f48fa989eed56aacf29c22