Malicious PDF — malware analysis report

Static analysis result for SHA-256 4668846504539aed…

MALICIOUS

PDF

82.5 KB Created: 2021-06-25 15:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9a5884d4e4c003e6714609781c59de1 SHA-1: d0ebc7fbe5edc1ff26eb9df776ee05cea59dfc7a SHA-256: 4668846504539aed38b3dd0744c27e9afefa951b7a7efe3c9957f6d152189d7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=how+to+get+dry+erase+marker+off+wood
    • https://dietacud.eu/upload/file/jitilikobebu.pdf
    • http://fantalife.nl/userfiles/file/66790652343.pdf
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/gilix.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/7qsvlmdn6bq2ra6mppl0os9p55/wujeserepe.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/bada518d3c2c3534fbd479b6d7ab868d/22622622499.pdf
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/72047134619.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/qe7pmr0fbaslhqebidqtvfqpv4/99042157360.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bace92036---46233690589.pdf
    • https://emauto.lv/index/images/up/file/muzinuvoxasijorisut.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c7f36c16---63190249460.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f859955c---difigikap.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4fb48873f---gafajusisuxaw.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/61ae94e5f3b251381810f7535a613a41/xobaderamafekuvapero.pdf
    • https://prtl.pl/userfiles/file/ravevitagomejofupuz.pdf
    • http://debden.org/userfiles/file/pofibojomowejezibagarapex.pdf
    • https://supermagnum-bg.com/userfiles/file/nimupopakuvugubuxe.pdf
    • http://www.conectadoscomdeus.tv/arquivos/file/dagipadenap.pdf
    • 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_off0000e036.bin
7891106732c6b29760e93743dad84bd0c4aeb19a86b2847f74f6623481dff54b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 10740 bytes
font_01_sfnt_off0000f8d1.bin
82504c2dfba81e86634c2337edbf9536f4a6e1ce2e2ae4ac1dd1f63a308f4343		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 16932 bytes
font_02_sfnt_off000124df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124DF 16792 bytes

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