Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c8df2445b06a95…

MALICIOUS

PDF

71.5 KB Created: 2021-08-31 00:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f89a162871f5e79586a5df22a5917d32 SHA-1: d31c4088d817aac37686d5cac0ea67e5a7e91049 SHA-256: d5c8df2445b06a95a306593a0834e172a4f0587fe928e1411e8007b6ec170ac5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to compromised websites, indicating a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with a high ML score and ClamAV detection, strongly suggests malicious intent. The file likely serves as a lure to direct users to malicious content hosted on these external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://synerhu.ru/uplcv?utm_term=chest+pain+resulting+from+ischemia+of+the+myocardium PDF link annotation
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/02da9f61b8df033f7eb8b2ad32b74ef3/tavuzekijigizetumepa.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/mewitemafuxaperokona.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b84d1e8df6d---dogabowa.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210619/file/16240760914025.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/94649135792.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/5373f03a699db511eb598df4929e705a/rosefenobafuzidawewenafa.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c44329d2db8ca480ae053c45d5c96651/13826740687.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/vemokilabebexivonupori.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/17800330874.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/85077968623.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba94cd1a2ea---wojozip.pdfIn PDF document text
    • http://expresskaliski.info/file/nirisibade.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e9481d6ebca---24889195111.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/wibixoxovifuxelijiwixak.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/75460769878.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084da2263cb1---voxutufezawi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9079eb788---sukagebasenitik.pdfIn PDF document text
    • https://nls.vn/upload/files/12062772970.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/wipabiz.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/fufiwobomomotedabipunaj.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607da26ddd24e---bigivodiwexim.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/917a982d40f6d04a575acf56643aeb86/20045524784.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_off0000b602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE19 11312 bytes
SHA-256: 22dfdfaf6a5004c191f193df3b046272625008db97312bb3e2314e797591b29f
font_02_sfnt_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 15896 bytes
SHA-256: 5da045b9c13d2691b8b1bdd50d56c65fdae2efabb3254dc335bfb101f6a4bf78

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