Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ca892e7c21c8b3…

MALICIOUS

PDF

73.7 KB Created: 2021-07-10 03:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24b0a27ac8b378b53f54df83099a0313 SHA-1: 05949a7010b941c7a4f5ed48ebea4d01e17006a9 SHA-256: 02ca892e7c21c8b3f2a1caa625751abeee6eb469d6bdd91181ed375f3f70048b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm used to distribute malware or conduct phishing. The PDF structure and embedded links are consistent with a phishing or malware distribution campaign, likely initiated via spearphishing.

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 http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966e4d47339---93295770735.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a95ec87bf248e0244249ea427d7c3c76/xaligep.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d22db90fe21---fejepetaxemot.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d9bfe4145---numosotoxuruvijiwawib.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1c946023f---98995747572.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607343a30af04---86238248480.pdf
    • https://lysgaards.com/ckfinder/userfiles/files/75430826186.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb21b0a3d6---gevovulobe.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/96080546086.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/0802367c1dd92304e9cf9680c6d9d30c/poritorexi.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8a85630d---pedodusof.pdf
    • https://hr-serdahel.hu/images/file/fupebij.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/1532kjur64b0m5kaqenkjd1cf4/xajigimajivifowuxozox.pdf
    • https://gw21.ch/uploads/userfiles/file/99143425058.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/84a6d87abc988aae4249a43e003fb50f/xunoliwo.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/22871776643.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608570b8d3246---56818054136.pdf
    • http://megat.pl/uploaded/fck_files/file/satuvidekomejurexuxe.pdf
    • http://moto-bike.pl/userfiles/file/lifosos.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607231b360e86---56117484390.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5f47cbdf4---kosaxo.pdf
    • http://phuongninhphat.com/uploads/userfiles/file/gigipepufamumet.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/d22fe1164c72e3572f2af9c140db0863/37000592589.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/bijanarobeliwopiwe.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dcb7327ca---49873925966.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=2+to+20+table+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_off0000c282.bin
4db50df4ce844f455a1cbddbe6a85b296ae4952165f1dbb32861e730e102e897		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC282 15488 bytes
font_01_sfnt_off0000ea1c.bin
1b7c7bf3633667ae2a3394517eeed8af9b91874b8ef7905a4a7a2c226c67df42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 10312 bytes
font_02_sfnt_off00010149.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 16792 bytes

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