Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef46f61bffc15fc1…

MALICIOUS

PDF

69.3 KB Created: 2021-09-23 03:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 43f6b51d4f1eccd6898c8de7dcf9a9ff SHA-1: b785fde11a50bbaf958b9eb68df844620d0155ff SHA-256: ef46f61bffc15fc143f977c546ad75624221f2264c44636b7c8b5ff5f482f2ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. It also features a large number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://allytemp.ru/uplcv?utm_term=powerdirector+lite+apk PDF link annotation
    • http://drivingtesttips.ie/fckeditor/userfiles/file/dijolukebi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b22e4284e6---lapaverejemipego.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/73336941534.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/lovedowodolimatirupojora.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/sojusujot.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/bikekogiteposomedu.pdfIn PDF document text
    • http://atomleasing.ru/media/File/2382417069.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/37174535512.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/totunabilenoveru.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed697bda2---63135286822.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/44166179724.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/parumilu.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/jovopugogubul.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109091159583714432aw3kpgpg8ot.pdfIn PDF document text
    • http://htwy.com/upload/file/towejeliwosikimakifebe.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1610d2dc69dbba055b206b47975d6295/pizevenifakafanogelexon.pdfIn PDF document text
    • http://semanbio.com/upload/files/vujiguxekepepuzuze.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161367ff0d2c2c---36138264635.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/75041759832.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c9ba62eee---rigogalapesavibibilareb.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/kisepapa.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/50971476644.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a21404bbc5432dfa96800472780479a3/85583243942.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_off0000b20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20C 10412 bytes
SHA-256: b657f11910169061e7e12821cba67f0758ba81991e8c15f7bd18c577a2ae397b
font_01_sfnt_off0000c9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D1 14912 bytes
SHA-256: 2ff2a4d108abeb3a688612f6221294ec278fb017156a5f6414fad7b269b9f551
font_02_sfnt_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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