Malicious PDF — malware analysis report

Static analysis result for SHA-256 b274fe8d4451f4b5…

MALICIOUS

PDF

86.8 KB Created: 2021-07-05 04:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3b5dd406e162de72a3361a393be7828 SHA-1: a75fc8ea9ddf3ae9490dea5c438aa1fb9e5a9a4a SHA-256: b274fe8d4451f4b536f0cad6744a85fce2a224e4cef1dc77a05880ab865f1e18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4bafc5564775850ff7036b115c5dab53/sowiluga.pdf
    • http://valsadindustries.com/userfiles/file/bofewawibe.pdf
    • http://ziconiavip.com/uploadfck/file/25956852128.pdf
    • https://quanghuydulich.vn/img_duhoc/files/31719438644.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc564cc6b78---fixuzomu.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/d989fd172bb04668d7d7d11ba3f12d7d/sikolit.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086df77d9c32---daseduxan.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b7fd61fe9b86b06f8ca56383b1ddf6b3/57592641259.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/41762cb2d9f9d03648f43c2a9d3b6fa0/toxidefagitewovujasu.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/fbfc5ac3537e22eb53d3c4ce7e610b03/52669086650.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f364e7d2eb---11273779222.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/84603298395.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8edc96163---xenabegifovasubewimaxoga.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d8033ada2ed---nilurajufamip.pdf
    • http://dgjinhak.kr/DATA/upload/files/202105261029242771.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/f9590c585c159634ede32febf783988a/26778062010.pdf
    • http://timeyear-v.com/userfiles/file/sumuviwolakowenodon.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/881e062b07c8fae970f505437f88176f/79746291297.pdf
    • https://chptravel.ir/data/file/wopolepuwalofetaxon.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d0431caa---sitonadixuwetidi.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/89ef6c3faf80d87c5e00672bb11dcb22/linibujo.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17832cec7---18695384878.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608397d733c70---93921469297.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cet+exam+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10a.bin
39ff42c44363b9a09e74e0d31be897d74baf0d594b0aff2eef60cd03ffec840d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 10148 bytes
font_01_sfnt_off000107b4.bin
07671683754322b4484521f81c62423982eb39cce38d621e62be04a87a69838a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 17948 bytes
font_02_sfnt_off0001363b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1363B 16792 bytes

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