Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa2d01581641fb6…

MALICIOUS

PDF

90.9 KB Created: 2021-09-07 21:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b7394e60dfabcf18f76ae2de9e6fa33 SHA-1: 4c3ec0398581e3ffc0b7439ed3ffeca05ae37cb2 SHA-256: eaa2d01581641fb6576aac2cc4ae4805b6e013a360e0e04917152bfc52fa1bfd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users. The presence of 'utm_term' in one URL suggests a phishing or SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://cructi.ru/uplcv?utm_term=walking+dead+compendium+4+pdf PDF link annotation
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32af43eeb8---kebiwibapijoba.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/38808149821.pdfIn PDF document text
    • http://yejida.com/userfiles/file/36666672307.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160832a8acc3a1---89679037995.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/pefixefagijowavinututifu.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/kugelilolesule.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610eaeb979fb8---kunisedo.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/dibujufadilibemowuti.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/jupudokujo.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/xoromumiropanupexanupu.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/da8c9e7bd861c9585bad169ef11d2828/79998321621.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/pusevudokof.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1fa8b2436a84b207cd1b9edce97f3a4a/39490667604.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a3ce997185b---jotavarabolijajebilixaz.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/18762056998.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/oova7jg2cr05683ucqmvk4knia/92096595863.pdfIn PDF document text
    • http://tfforming.ru/d/files/75974473795.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/saloxotewiwidisesawunowuj.pdfIn PDF document text
    • https://mmszke.hu/files/file/527429061.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/kokikukituro.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/voralum.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/bibefemum.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ee4ec03913e4bb370e40adbc6d85e660/99862556848.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99614106c7---28159244813.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_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 10860 bytes
SHA-256: 8aa9742b5309c7bbf44b1de47f3e9e1e41cc379d6e5ee22bf0731a28c4e46513
font_02_sfnt_off00012c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6C 19052 bytes
SHA-256: 99b609a23e3c31d491831a47b5dbf19969ae9ca62ba1799a001ab1525f06aa54

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