Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92f055172b85fc7…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 10:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3d1c743a822be80523b3ad5db73b5b6d SHA-1: 36245248fc3dc57d945949ca04d180d9e1829622 SHA-256: c92f055172b85fc7bc12cc8f65194b8ef0adaf3bbcff7e6a4bad90a3e1284eae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=pokemon+go+custom+rom', are likely used to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=pokemon+go+custom+rom PDF link annotation
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614dcb9c96154---bajorilufo.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613256243a15b---29763284129.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/20629523959.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/repelujigunosomof.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/13939884328.pdfIn PDF document text
    • http://elitacasa.it/images/file/92106158694.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/nebidapavariz.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/kurukinotomixumetaga.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/33519856130.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/giwidamor.pdfIn PDF document text
    • https://kar360.com/resimler/files/litedebak.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/badudezimageseporu.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/duripidimifutad.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/dabetegarowelanemegofose.pdfIn PDF document text
    • https://tarsiman.ee/files/file/filutefomakefebakebidiji.pdfIn PDF document text
    • http://rts-3.ru/upload/files/91963537353.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/17533125211.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7c23c6343---nujisometejuxikike.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/49192244049.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/4737299514.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/94137768634.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/firasax.pdfIn PDF document text
    • http://sungder.com/upload/zeveporatefagizafev.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/87780025832.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/wudejokuvamawo.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_off0000b105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91C 10468 bytes
SHA-256: 80c7dfbe0de8f62a99d6b9634c387700c8202207b2e12c57c0a3df24a3b8fe1b
font_02_sfnt_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 15668 bytes
SHA-256: 2392999812c6acf99fdf079ea5d21a6077610023aa266d0beb87234dd5cd5f02