Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2e4ead56dae1bc…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 01:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b7add27d4a56db7796a36220dc914387 SHA-1: 6a82ffcb3ca8847d0ee750193807dcb1c9b7a90d SHA-256: 4a2e4ead56dae1bc31ce4856c0bedee29b23b29b9785307bb9a7f88634988cb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The primary attack pattern involves tricking users into clicking these links, likely leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://crewmak.ru/uplcv?utm_term=sbi+po+2019+syllabus+pdf PDF link annotation
    • http://3bbb.fr/ckeditor/upload/files/21183787928.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/01a39a337978ef570f8ec7eeb13c2c0b/fapijevetetuzokitagasuje.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/12351908453.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/bigusuvexizafofi.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9469b00bc42d91634fb16957d762067/38354385010.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/90611755953.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/38346597517.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/47648621053.pdfIn PDF document text
    • http://geasit.it/userfiles/files/16101166776.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/duvetuwe.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612149294a78e---92482888191.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/5mup74fdpn7juusgc1pms7e5hu/73175483911.pdfIn PDF document text
    • http://dges.in/userfiles/file/85958295507.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/bopejugemonizodiruwewanik.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d00bfbb3429---56165527172.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7cf037f8d---43390970801.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160da51ee3723f---maroranurujigafu.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/lafezurotukivituxusawo.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/wixejopomarozejigosas.pdfIn PDF document text
    • http://arslanemlak.com/E/file/femubomawunukovunifenitu.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/08/files/210818130759.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/17039288549.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_off0000be79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE79 10948 bytes
SHA-256: 7a347a76cba5e16caa7023ae1d53786ecda4def611b77c9a9bfdbc37cfb498c3
font_01_sfnt_off0000d7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C8 18012 bytes
SHA-256: cbf5a34e7ed6baf8c9e3399c8248a93021dcc33bf007b550be2e97f4d4251e86
font_02_sfnt_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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