Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f51de3c773c187…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 06:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 90b35eba21875e9f90516ad74ac08ee0 SHA-1: f1a4c5bfb965e879214cf195fab06eef0e61e6cb SHA-256: c2f51de3c773c187bef4fb6a1990d7319db0e4e9ce83289dd1d921250755d41c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://garglob.ru/uplcv?utm_term=sdk+tools+package+download PDF link annotation
    • http://xboxheerlen.nl/userfiles/file/40023952872.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/19882443034.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/34509688467.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/46537149697.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/gonizoruno.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364a324761f---73946568564.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161359f7ecbb45---59617550566.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090719314635.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/79779188024.pdfIn PDF document text
    • https://n-tlg.com/files/file/nojamazegamefisopigel.pdfIn PDF document text
    • http://holzweiss.at/11888090878.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5f5bca9975aaf2adc4a4e7b586f99087/27425177060.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/25295006127.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/nulowapulujimipanuw.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/kadomaburekomaxalosebu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/19fec863e60b48a37856362a2b70aded/jusesonisusedazubenot.pdfIn PDF document text
    • http://rotang.net/userfiles/file/japekazefipiduwarati.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/35138783435.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/21397500939.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/jalozinopitevakafetuwovu.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/kajojobudinimalijagunu.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/32199350253.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/81761409846.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/pupibagunifalomedafu.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/nuxuwakofivofix.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/banerepituwelokutanugejov.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_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 10752 bytes
SHA-256: 36fe87c7bd44bbb46311d9242438b8495b2f1050c5626dceb38cc5c1639e9f78
font_01_sfnt_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B91 17468 bytes
SHA-256: 705bd5cf067bf000f51b42a69f61927f9191903a4772a78ba2d4ec7db24bfb78

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