Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a942ae64b75fa6…

MALICIOUS

PDF

87.9 KB Created: 2021-09-20 16:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b43f0354a91f694af753796554f5978c SHA-1: 2456e9142e1aa8c4b618832e76519f8267596588 SHA-256: 45a942ae64b75fa6c6965a3432c83a60fdd4a321c9244e03684ebfea54a255b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=streaming+film+wonder+woman+2020 PDF link annotation
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/17311895404.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/14242268080.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/votuvakimubigefoxifaf.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4d247f61---72570439627.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/97189646605.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/15727474195.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/88622437669.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/90603433781.pdfIn PDF document text
    • http://surestegc.org/documentos/file/59010717013.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/63741972240.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161438860e7b51---39841915366.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/63605832136.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/3272767778.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210913082907.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/bubakiniraponedo.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210915_21A1C17540AC5DB8.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/sefixa.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/4f906694f1ed4f5d0bc177ab3f8e5ce2/36261028386.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/db062d8ee09d2d781aaf5baaceee1076/14284619743.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139edd5c62db---82506737137.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d367e364f4---63182456940.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210904235042.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/9772847286.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/dunemumopudaf.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/nojas.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_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 10932 bytes
SHA-256: 2309450791407a2c36414c8e66705fa7115ff00c21b0681940de887a26ea26cd
font_01_sfnt_off000108d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D5 18720 bytes
SHA-256: ec3fb77e0c3c8770388b3ac65dc3d841e4a5092ddd04a5defd6ee2793a418e9e
font_02_sfnt_off000139d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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