Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65b5397ff3c0f3e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 21:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b693191c8b1b5775d09a2f3a1c2de22b SHA-1: 472ce00824948585ed3c367fa36fbced21fa4976 SHA-256: b65b5397ff3c0f3e3342d08f72730262ddc63bb611ddac2ebed430e0e3900080
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=sql+add+column+with+default+value+in+select PDF link annotation
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/3b62461c808c7348aa1a26dec5290756/30669661878.pdfIn PDF document text
    • http://flirdining.com/uploads/files/41612437189.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/14812711286.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608383a564f46---42912508912.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/54214702873.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/xurokasixebefitapa.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/vejetikukavegadaken.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/81c5303104ac271cdde4d91c2615e62a/97391307638.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0b6788ca4---vafijeset.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/86074438796.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a84c162aaed---63729996560.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/37948301505.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/25327536325.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b81fb537e5c---tibaloxerakize.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/pijifowa.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1292cfddb3d6bdd974f6b403e4403575/42905595076.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/35305995460.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/390baaa3e9fbbba3cfcf1ca6edc3e0a2/bozujijagogu.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc79a68e5a5---69119605422.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115d431a843d---zofama.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/55719974342.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210503191522176.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_off0000dc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 18024 bytes
SHA-256: c2b915976b7a9cc86d3736786ea1ca3e6664c1f044ca5ea4fe076cce2af40985
font_02_sfnt_off000123a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A5 11116 bytes
SHA-256: 07e81e64e0165c17e47ed3c95b8ef21d02b2a96877b1b0d59077f91fe216bc59

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