Malicious PDF — malware analysis report

Static analysis result for SHA-256 5774f5908a6cb7d8…

MALICIOUS

PDF

88.2 KB Created: 2021-09-08 10:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ebc28b24c1370a1378df7eba46448583 SHA-1: fc38bea0751eabbc77c9b4ee4891b919d107722f SHA-256: 5774f5908a6cb7d840b2e7cf67c86cde13c56fa6c563224a4646c9c22520f8fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=research+design+qualitative+%26+quantitative+approaches+pdf PDF link annotation
    • http://medica-eg.com/userfiles/file/rimane.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/88057990508.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/davijurovinusokufusiseve.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d11948ed84ff00f55a56833dc80ac8f/52610540996.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099c8795b404---38010535820.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/oflurncrri2kuta6h6s9j2fulp/3005749854.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb00f99a899a1c805b7797af853472ac/26340341359.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/ruvuta.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/wamilewibuz.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/kaxeri.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/pidematixiwoxekapujulavib.pdfIn PDF document text
    • http://vncanada.vn/uploads/files/fibewomisibemuzafemod.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/57928a0e6a009ce362159c1220a5d446/35959677188.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094c88f7a724---digusa.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/0pgsntdqo7a2ao56faj27ogkmo/gitizuvozofinov.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202188124146198.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/pefatawefege.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/81572448948.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/7913052477.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/3a5d9f23669bb89940deee8045dd3e93/vefosowidufekujujoderu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/13551c3e36e2d3bcdd0583687a6d82b1/rebak.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/62786617686.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/foxorexopexipidiwop.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_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 18740 bytes
SHA-256: e64d816a0c1b43b2b9e70a161d081cdd786bfe95601bc29d4b4c8092440586d6
font_01_sfnt_off00012243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12243 10888 bytes
SHA-256: 203dae53878e0d0205df9ab09c11e8b1fdaa8671ddf9ffff20c1501092da422f
font_02_sfnt_off00013ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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