Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b3c0e2181b1e1c…

MALICIOUS

PDF

80.4 KB Created: 2021-06-25 15:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b50bcccddfa6d17a6b0e2165234390b4 SHA-1: f4867abe02c197d72bc7b662d660761ed2e1d180 SHA-256: f2b3c0e2181b1e1c3e5fac8cf61d1ea02c9baaf673a6e3d7f5f1713723b35866
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites utilizing the formcraft plugin for file uploads. This suggests the document is designed to lure users to these compromised hosts, likely for further exploitation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607901114f8e1---vinedakolixenedaboropanin.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5fc81c511---tegafev.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723977c1706---paguwabojalobezepiboneki.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089d0ee8ceae---61446256115.pdf
    • https://stallion-international.com/userfiles/file/mevetalaveduxujadodipug.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/44ade2cb8a5b3fadd4e383766ec6b108/92844620087.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/f85ak06gj06o917a3aut2tpcp4/nozadevokebafuwoz.pdf
    • http://cucthongke.vn/userfiles/file///lolelegebuvibonine.pdf
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/81551036178.pdf
    • https://timjanen.se/anvandarbilder/53/files/pewekipenavag.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58db77688c---gebuvubot.pdf
    • http://www.urbanwaterways.info/files/tupotebigisurovagofoxuwe.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/v3q7qr7tqp60j80ccoiq53e3bg/xijopuledipogijiro.pdf
    • http://hodori247.com/uploads/files/49891332722.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/383567ec8abf4bd8a7a8f26298c3623a/86047903843.pdf
    • http://drivingschool-brno.eu/files/9100379836.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+secret+life+of+pets+2+full+movie+online+free
    • 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_off0000d82c.bin
123bd292bc1e1f2cb2e61c48b89a9e880f268dc4c81a429e91e76cbb5b398c54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD82C 10832 bytes
font_01_sfnt_off0000f10e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 16792 bytes
font_02_sfnt_off00010920.bin
75434cd9aec1e0ce2aa6394f1f0fa121176a9a0df470952b04ce65a6d70a50c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 16928 bytes

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