Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3175cddc419bb2b…

MALICIOUS

PDF

83.8 KB Created: 2021-06-25 12:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e3e8c7c05255994d6b044cf2abe800f SHA-1: 761d6725fba5172e23dffc0bda7974eedbef4a68 SHA-256: f3175cddc419bb2be80422dad7a3f626bd0a6c45eba98442f9261afaad3114ea
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially host further malicious content. The presence of multiple PDF link farm heuristics suggests a deliberate attempt to distribute links to potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://sola-brothers.com/userfiles/file/75300901030.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-11/20210511101041138097.pdf
    • https://powermailer.in/userfiles/file/47901942432.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-22/20210522035244486031.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c338dbd1aa4---4325279284.pdf
    • https://alakharia.com/public_html/userfiles/file/41003241813.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160707e4482251---8726223960.pdf
    • http://solee.cn/ckfinder/userfiles/files/35300033472.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/43545880bcc030c92917ac92a483b3eb/39770391713.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/o35g61sadt14us5qssk7rsl8r2/wofulikilo.pdf
    • http://3qbuy.com/CKEdit/upload/files/93711390596.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c9a613117341b6cabb65eae8e4b097e8/demoneganedejajutijufodi.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607afc2771cca---lefofivelenewelanopek.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0835c9d0---18475688889.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=rope+frog+ninja+hero+cheat
    • 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_off0000d9ec.bin
2141cef4a2e589da38c945ce149eae1c3033b4aba50768c849075e5564dd34a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 10720 bytes
font_01_sfnt_off0000f27b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 16792 bytes
font_02_sfnt_off00010a8d.bin
586524f0e644c241633cae546158a9e5972658e1a21a413fbbcedfbba7a08c75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 28152 bytes

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