Malicious PDF — malware analysis report

Static analysis result for SHA-256 02317be55ba712eb…

MALICIOUS

PDF

84.5 KB Created: 2021-06-28 07:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e5470e8e05f1fbed855864093d7eeea2 SHA-1: a4dcbc6442608be397f4871ceae1b014d3f7b640 SHA-256: 02317be55ba712ebc4a20a17cfe3f2a357b29d78a6f9ed950821b49b4e9feb06
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of a 'Password-protected archive handoff' heuristic indicates the document may be designed to trick users into downloading an archive, which in turn contains the actual malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/uplcv?utm_term=how+to+protect+pdf+from+editing+without+password PDF link annotation
    • http://sport-way.ru/img/file/witaxazejus.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a842cd5d921---kuvepejimapeji.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/sigufuxezekixot.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/afc9d6b54ac70c445a6879d8d573de44/57508693300.pdfIn PDF document text
    • https://ebooksweb.net/files/file/69580916712.pdfIn PDF document text
    • http://www.puhito.hu/uploads/21670723474.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8aee52b00d---zabalef.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/potexamaxelikojonalu.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608658e2e0c2f---fusowe.pdfIn PDF document text
    • http://immopolignano.lu/images/66395732161.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/fosexoxusawot.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085498331b66---1106931672.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/83015388710.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607a727b3ce6b---11584220858.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210618_A08364A69C063985.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd71e4785a---28158743338.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16078710eaf3ff---88895328582.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4abaddd432---84122510777.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a368c310f24---70250304167.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/manofutu.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/vvmjrpn9l4uvqam76otc0codv2/34329755093.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/e7c26c2d25d51c378489bc0a85defe20/35527863292.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/92944008633.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 17140 bytes
SHA-256: 37b3404d81c7ed40aa83c5e4f7165cce0a4c43a108a2c9d83ccdcaee697738e9
font_01_sfnt_off000112b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B5 11200 bytes
SHA-256: 6f05a21679bbaef38908d06ed64faf117e990715028a230ce1a38c1d6d8db869
font_02_sfnt_off00012c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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