Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59aec0c8f19834f…

MALICIOUS

PDF

89.0 KB Created: 2021-07-19 06:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 826eb31b2b97a21fb5f3821f3bf37522 SHA-1: fbf903412703a099e5e73ad40d67f8dc3767f801 SHA-256: c59aec0c8f19834fe948bb80c6c48b1a4eec78e357f0e5cef2f3fc4b6d308fea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads. The PDF likely uses JavaScript to execute malicious actions and redirects users through a series of links hosted on potentially compromised sites, aiming to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2272c305cc---38477738482.pdf In PDF document text
    • http://jjmcp.jp/userfiles/Image/file/mivujoxatukasapolebalo.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2697b1e91f---69409012530.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/b744fgtfpvf3cc5ofahrgeb3vq/639600886.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d188cc5acf9f30fbbaee72c62eecef9f/51891808812.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071671bc1b29---73152505306.pdfIn PDF document text
    • http://citra.cl/userfiles/file/84479197889.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050223485455.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4598812a1---juxabiresewitugikawamat.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/39032522146.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/kalabekibasewuzerisaju.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/90788539827.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/30e88bb1d366421913d1fd7fa64aa180/32643105858.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e08f168e6cb59e3a9b2b3db2db9d0ed4/69359448847.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d673c186195---839435800.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/7d61372jme44eqq98inqfnhks3/dopabuvelujo.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/4d2b47f502916f180a1cf1a587abcc18/87407512236.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/70512488407.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/67877330407.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b827e7aa0---42591576143.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/21363598519.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/65662666858.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081f5103229a---xosugufixogikar.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ol4d29emjv9d0i5gg68mh7s64l/rusugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=better+than+amazingPDF link annotation
    • 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_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 18120 bytes
SHA-256: 1a305b7e8f046f22b1d559fae10b27dba87dfa673c2a8d8e47b4994db88a1f37
font_01_sfnt_off000127ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC2 10332 bytes
SHA-256: 6a7569d8123a25b11964aaed0024c89e2b2431a5169da2d92dfcb567c0f42cf7