Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33305efc373507d…

MALICIOUS

PDF

90.7 KB Created: 2021-07-31 12:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d42d1c69feccafecd7614264878f0720 SHA-1: e8b7ccf1a26a8cc7e78d323e8e30991c9356956c SHA-256: c33305efc373507d1d5eaad68851752af492d3c83a173d175ecbe2cee0f67ea8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple links on compromised CMS upload storage and disposable hosting further supports its role as a distribution point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://synerhu.ru/uplcv?utm_term=kate+mobile+29+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C PDF link annotation
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fc1cdb917---fuseferaloromavutajutaku.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/puzamut.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/20844748751.pdfIn PDF document text
    • http://614move.com/clients/4890/File/39515895747.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/11s56tb5mgh375nvng91ic27d1/jitegu.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/kuvadefotanutebuzefazama.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f305168857b---52109235975.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/nalaguresunewatutubabaka.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/b2f057e5a03a93183f1d9239bcef1a86/nurux.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a03b2684d5e---77123806669.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/vexonimuzixipofebigot.pdfIn PDF document text
    • http://hevolta.com/upload/file/62840713654.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/f0d92da09f617563600593a69f4b141b/kunozirewimimovalatigone.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d13799961---83909497737.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/29707909901.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/79e6a4ecb57d4a24a8e74d5eb3282a7c/92752525683.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2c6d11f73---nejeto.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/kapoz.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5341a4667f---28132586715.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608550a52ea1f---rilumetotud.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/buwudalujamikis.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/fuvekodebulunana.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608867f32a49a---94425794411.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a56107d86cf82127b32fc8ed66108e64/buzojejademenazaji.pdfIn PDF document text
    • https://landbar.com/upload/files/48917590197.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/wurekatosapifatibe.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/8fbe6d875819aac86c6e1a648e42050c/vasugudamejilatapo.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_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 21644 bytes
SHA-256: 1e9b5846ab7969ab26c82142be258c25af445cbd90a7429a6478d8c98be2a5ab
font_01_sfnt_off00012944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12944 10956 bytes
SHA-256: 59763d5500a7db9692518a48d6b24c1597a4d5f364d2072d32090ac7b62053c0
font_02_sfnt_off00014258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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