Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27241427764b74f…

MALICIOUS

PDF

89.5 KB Created: 2021-06-29 00:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e541873378c9750e8e56385e0a99a67 SHA-1: 8166ab37bb1cd19ed0c26317f9591c28d039ef58 SHA-256: a27241427764b74f35503b2b253aebfa6c3b4a5b7c66d0aa9f00782755f6089b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. These links are structured as a link farm, suggesting an attempt to direct users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ad77ec9f3d9---nedubakidipenakurenirugi.pdf
    • http://18554080.com/userfiles/file/meligawolupuvunapuzerosel.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84d22db983---86183444818.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1fc539e0d88bba7f96416fa91e39ef52/pojimoxulevuvavuzopivuk.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/98odtlhm7cu96gflt9g5o7ufei/lilowinakibavir.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/82f6735bcfd96428d530daef7e9b6592/zukotawogixe.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/12bbdbf549ba2a25a2c5db254737f6d4/bobelepumejaropejag.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/fbh67jpet0uh6ve5rp37dpvmvo/dizerovotesemabotewufito.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7822d58a85---zuzutafovavosa.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607748b660685---1624226288.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a89df3c6770---nedopisuju.pdf
    • http://tfforming.ru/d/files/56254505837.pdf
    • http://meble-tk.pl/userfiles/file/wipomiwesavizud.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/25e3dfc3e8c8f9e80fe66f59b3c103ce/33787790589.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/1c9f96768f7dfa3647452844a862574e/18243351997.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a6052e38f---dutolaruvazinalume.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073b87e8ca82---37324193186.pdf
    • https://aprilboya.com/userfiles/file/nubilumuluwinebisesu.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160838c942bfd1---pitufe.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad97dc0fdea---40544310849.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ld0mpcl2938arrkcdhe7jnn912/79367816940.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a552a9836---pizozabinuvutolevezoguv.pdf
    • https://alakharia.com/public_html/userfiles/file/10731808990.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/e8e00eda34b5c4e309147d3c224a9c52/8664144105.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f9f708ded---51288919206.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=30+acres+to+hectares
    • 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_off0000fc94.bin
a0ab8692f7444347bff116dd24f842555cd2807aa0f0090bc343c9c75016a65b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 10284 bytes
font_01_sfnt_off000113dd.bin
a7e9fb6d83828077bc9a3da5958d2728b97595e7fb1314db1b30ea065ca1e49d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113DD 17056 bytes
font_02_sfnt_off00014092.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14092 16792 bytes

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