Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f3d293a50b6a01…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 07:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e491f70e8783298c0c7cbbf4f6595b01 SHA-1: 495fa15e834f25f155bbe38b9ca17849c5d5bd84 SHA-256: 36f3d293a50b6a012b51050f10c86e56fb50ebfb6c54f0f444932ff962790577
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attempt to lure victims to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://aravlicraft.com/cmsCart//upload/file/8181029446.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2063737e---45138760.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/f2lklp97408oo58bmjc9a4q6es/29261320297.pdf
    • http://emirates-offshore.com/uploads/image/file/pevegoza.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/d8amsorkf4uvo1isg59t2ote1r/wenumereborig.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c22f73536a4---nojaripidivobibavu.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac54c910583---talasiginotubapigu.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076be9be8598---petiwegelun.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210613063353.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/728b5a8115e13df53109aeffb2b5519a/lepepatonasekoluk.pdf
    • http://njuhome.pl/ckfinder/userfiles/files/47950850346.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b8b28b808---rumiboxukivebabakij.pdf
    • https://charterboatdeliverance.com/uploads/files/fakeruvovowavo.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863d0dc513d---zemasesezobatejeweg.pdf
    • http://mlsy.cz/images/file/files/nusorilufuwusebumu.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718ae146e72---vukilidifu.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e26d1a8d1---famom.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ae1ab6979aab30576182d29bbf0ed119/63978836620.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f5cc8e6151d465666499a7c02d1e2503/kibikimisuvefenodikil.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vdao4plf8vne2bprbk59u4kp70/nutoligiwomotev.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/61f5cb04e013754b17f0a3ee2bebd0f5/zamomovimefotifoxened.pdf
    • http://chokmanee.com/userfiles/file/87804987003.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/72eb0bf26a19afd2c0abee90f43df438/boremagigadotova.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=use+router+as+a+dhcp+server
    • 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_off0000f492.bin
62958c91a724367b854ed7908ccabe58bfbdffd21da011a5c6845f0295b7e897		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 17492 bytes
font_01_sfnt_off00012284.bin
53d586fb6e1a49a0e222a7d1534baf9cc8f9ccbc4d3a1f2b43c45740c11b660d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 10540 bytes
font_02_sfnt_off00013abb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABB 16792 bytes

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