Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc125abc9ad4a438…

MALICIOUS

PDF

83.6 KB Created: 2021-07-06 20:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95afa6559f9b75f3d3fc551dcdb060cd SHA-1: daabdf47f6da8a13f147b3d15407fd7cea96ab7f SHA-256: dc125abc9ad4a4385e371e101359521102344441675d04596f701345796ac4e2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://perseverance.cyou/updatefiles/file/661946651.pdf
    • https://vydavatelstvoklett.sk/userfiles/file/pegofu.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba75fa38a5a---tidan.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b494063c990---notoluropokoxagisiwaluli.pdf
    • http://angarakshaksecurity.com/userfiles/file/83911627444.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/sd41ev37m4ubbkfb0lci273tt5/31168859289.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737d5d71be6---kujixozanuvazazu.pdf
    • https://ferado.vn/userfiles/file/83008010690.pdf
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9364089b---dupavajemopama.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085977c4d172---16019307934.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39f675e3b---linezeziwuwimomagowu.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160774c9c04f10---41883811748.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac2ce463d9---69164677765.pdf
    • http://ankaser.com/userfiles/file/41932637816.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/lngic7n7rdaoombondgvbre4gl/14544531246.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac0d004ece---23464929489.pdf
    • http://arqing.es/ckfinder/userfiles/files/90611785463.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3a2b34ab7---jogawapefulara.pdf
    • http://asfus.net/virgsurv/userfiles/file/59837864956.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/995cpod4tcseh14529sqnb8jt1/15352932972.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160863e2801c2c---64171000894.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/98hqshd0ile10pl2hc77vuiiqf/duwepedipopolidun.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2b9fac841c68bac4f693733b90358904/640711973.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160887b52e2880---zixakibino.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=short+time+fft
    • 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_off0000e49c.bin
ce39ffd5ac0330b897150050e022b326c8da5beaf87c783ae41d350aaa0add39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 10072 bytes
font_01_sfnt_off0000fb0c.bin
6ccc5538f03f6bac9c4e0c3435322b2a48505f6efeb70a941fb5daab4640028a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 17360 bytes
font_02_sfnt_off00012945.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12945 16792 bytes

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