Malicious PDF — malware analysis report

Static analysis result for SHA-256 f063e3ce5b3087bd…

MALICIOUS

PDF

98.9 KB Created: 2021-08-09 07:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d88c57d49fcc3711edbf460232f70af SHA-1: 99150184a5e1d6c3af09dc5e0d739de25ab6489e SHA-256: f063e3ce5b3087bd668280ab594c090ed3ea43e999578f090ea7bfb12f1769bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous websites, many hosted on compromised WordPress installations or disposable domains, likely intended to phish users. The presence of embedded URLs and the nature of the heuristics suggest it is used for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=manual+citizen+eco-drive+wr200 PDF link annotation
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/77269858061.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160798cae67d99---vawidibut.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b65dde65e820dc2e19034fae7dfe0c7f/dalosowe.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/17525519599.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070973c02b5b---wazoridazexo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f173d11a---17353420565.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/quci8s2u3ra20aofpjd95elf59/60237353939.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/96bea2f77ff2ea166eeada02a6228a3b/lekuka.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/sosasotaku.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56f32e339c---15705003224.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d2886c4487a0cd71a8599560fc697df8/27586635709.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/923f41747723aa708642ddd3b251a0bd/fumezititexabuw.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/48217003480.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/badel.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/bunovovifitejibuwevuvagas.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/38957186728.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/jomuluferemafuzipedebi.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/14835182580.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cc0226368---varubiwezivifakebavo.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a1327ea8d---57419312459.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9f71c0f56---5590935386.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/c7dd1f3ced3edab8e83cbaf1c1691a11/votebunoxekile.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/92673384159.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FA 23568 bytes
SHA-256: 8ddaadeafb2af2e91b1ee9d990e4c619f1fc2fa708f6814fc50969fc6c3e47b6
font_01_sfnt_off00011ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FF 17000 bytes
SHA-256: cd757eeb5f22257bde84b8697bfab8b3426bbd492c2146dae0f90e61287600af
font_03_sfnt_off00016212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16212 10776 bytes
SHA-256: 1500438e1d1f269c3a0fae4f6263dc879baefe54995583835612581a99072e6a

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