Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f9d01eec310049…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 03:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09e03a376924db75650069c3cbf2494f SHA-1: 92dab209000f00666da4d24db55d9959b87eefe6 SHA-256: f8f9d01eec31004970c3d055cbd134f87dd7d4ef9bb92dc904bdb50d198c6d09
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://irlanc.ru/uplcv?utm_term=pokemon+roms+desmume PDF link annotation
    • http://chicopharm.com/upload/files/xabofurekadigiraxufit.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109151128367449.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/31455360873.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/4050000217.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/72529478381.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/nunominafo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e997c48c59---feketukod.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/44683229609.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5951a1606---zodelukatedufopokuluk.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/vasunujexipibenatodopiko.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/suninofobakefupitamupu.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7ba79ec4b---31321712055.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/fekusanefoguburaramowa.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/xeviwezobomisuw.pdfIn PDF document text
    • http://soc-in.com/data/media/files/45818459108.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/92287532921.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/putitaxelasoxavagejolu.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/004939dqeur7r9svp1c0q9b1l7/28102712542.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/96387113779.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/80317878819.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/99550244804.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/gaxopunebaz.pdfIn PDF document text
    • http://k1a.ru/images/files/file/75354087399.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_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 17740 bytes
SHA-256: be5287da0499c2e110df1b3ce0fbc391b51a952bc62bc49e2cdb848ea5c55cd7
font_01_sfnt_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 10204 bytes
SHA-256: 80f6479e347b2bfc859343b1704ac30c9d6ed4f1cad9ec477f28e6fdf82bc1fc

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