Malicious PDF — malware analysis report

Static analysis result for SHA-256 485f8d8e6409af8c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 05:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 271cd61e5f1132ad8573a2eaa2490baa SHA-1: e7ccffe4cd6463deda4b03e2858dd9f19df931ef SHA-256: 485f8d8e6409af8c5bde38f09b9736af94e8595196075829dbd590e2df33452f
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 functions as a link farm, directing users to external URLs, some of which are hosted on compromised CMS platforms. This pattern is commonly used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=briggs+and+stratton+6.25+hp+engine+manual PDF link annotation
    • https://tidymoney.com/ckfinder/userfiles/files/62306852068.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c113599089d---pisexivazuxelekaguzev.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/o163ul98iaa3h3u9g4jmcihlbk/3994578359.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8bb303683---saridofexebewadarit.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/jodegisejigukiruzela.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70239286401.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/54893284356.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/99637072151.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/lufedu.pdfIn PDF document text
    • http://szwygs.com/upload/pidotagelopib.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210809_144928.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/fk0manus2dp44g195fr8tfc63p/16588361704.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/b43885op3rmlg5a3l75jmv556d/kixudigosojixezazog.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/lisotafux.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/miwuvesiwedoxanep.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0eaa20812b2c6f9831bf770f89cdb9c3/91463592362.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/2708c7f8f11cc5fda654ce9d1a6f7bbb/nazixokuruzu.pdfIn PDF document text
    • https://mattress-leader.com/media/13304278157.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/c6hrm778bdn3jln2r74qrbots6/gisirutofemil.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f75b09a371e48025169d8fcec125eaef/25718815914.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ae643bdbf---vinawap.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/lafufifivaj.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9c75901eb51262023816d389b547c39/tedexepusibabifedi.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/zebuwuterazetuk.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_off0000d9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D3 17788 bytes
SHA-256: 3e3834e1620eddf5cdd0fb0c0e9c41e53a541caebcd2c2f858a67694f53eb560
font_01_sfnt_off000107ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 11480 bytes
SHA-256: 3a14989841f7404418f6490af4473ac0b868d76ae60e2ebb0fa30360c7f38a87
font_02_sfnt_off000122ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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