Malicious PDF — malware analysis report

Static analysis result for SHA-256 87dc3bea6c423610…

MALICIOUS

PDF

340.7 KB Created: 2021-06-27 05:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aec8982ce1f26bbda69b26f1cd8b1ead SHA-1: b6c44fce9e1a77191c5e3e3e7e9b5abf2d121bbc SHA-256: 87dc3bea6c423610ebe4724dd61e8b3994d0dff8989ea89726af9ee464fb0dd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The embedded URLs, particularly those hosted on compromised WordPress sites, suggest an attempt to redirect users to malicious content. The presence of numerous external URIs and links to compromised CMS upload storage indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9778

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=body+solid+exm+2000s+manual
    • http://zjpjxt.cn/upload/uploadfile/file/pekakila.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/75oh4l8fn3jektjl2lhe34h3u2/gefijapemudunifoxozi.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/32195117965.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16083733f7bce7---17440360236.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/b60anh8qul4cnl3t8bdtn7bjfr/sazozufekefur.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/174ce30c618d74ba2429566d35150510/gebexigedavalujagogepile.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/60f4fd6c01371a18d737e5faba590f5d/74439838472.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741c1670802---26529667842.pdf
    • https://advance-pack.com/editor_upload/file/39795200801.pdf
    • http://woodbridgeabw.com/uploads/files/rigodukexuzibof.pdf
    • http://pkynfe.net/userfiles/file/49427078962.pdf
    • https://hkbca.org/UploadFiles/file/20210605004413109.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcb3eba78c---silijezononizidoxe.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/6bf9e0fc26e5ddc1b15a7b96bf59efb8/62338511138.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160814834b26f7---56455477000.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/4e221b4bea871ca37e459b6687dce533/91380994164.pdf
    • http://savvyais.com/userfiles/file/33805984098.pdf
    • http://netinflux.net/userfiles/file/59171535187.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/0a614a283fc4ea3daf12c1352eb47271/gexugegefuwe.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608aad18e81f8---miniderilugopotataj.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/c10scnjv1pqrhp32tii5iothn3/rigozelalejun.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/5l8k396775vngf7etp37e7k7g5/bunuboxusatux.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725d054d6bc---wabap.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6139443a747e4d852805725d774e88f7/wumofigigodawelu.pdf
    • 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_off0004cd08.bin
acef84d6a91eb05c8ef1af6d53f963ccf284cc4f3f227b1c31371f8f1f64c44e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD08 10820 bytes
font_01_sfnt_off0004e60c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E60C 16792 bytes
font_02_sfnt_off0004fe1e.bin
6c48ea7c9144e3eb2025f6ceb21217d16d743fc7a1e040b38a88da4fd7c63ed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE1E 26856 bytes

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