Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a18be14cb246aa…

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 01:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7bb3439a17716c1b51f804c48ba811ad SHA-1: b224f9b069c1578fce9634d639aaddc587cf5ed3 SHA-256: 87a18be14cb246aac0cc65a5eae1b5f12283f323566336d2584190401fb368cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://greenfuturevietnam.com/Upload/files/bapumomizopiwamenenewul.pdf In PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/g9nbm7mp1b6dohn43g9i8i4d3m/13858464280.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/82582022506.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/reraxolok.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/mevotu.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/42308452493.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/rarinule.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/19714077130.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109030610025362.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/32700359075.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/30300493362.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/ponod.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/88776047437.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/kuxeloromoxeguroguxisuvog.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/11240820198.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0d7213f69d017bba2c5cda2a790a885b/bopuwibozuvimevubi.pdfIn PDF document text
    • https://rjpexport.com/files/39960858253.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/67083358090.pdfIn PDF document text
    • https://grancom.by/upload/docs/kuzusirutenilawukidizuxov.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/fanarif.pdfIn PDF document text
    • https://iohrp.org/f_files/files/77399427404.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/47441240003.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161331d37a2e82---68773349158.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/97134825628.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/miluw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=bahubali+little+singham+gamePDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/77527686173.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_off0000e01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 20420 bytes
SHA-256: 29cd57ab4b68c5395a502cc0662917eabc853cd87f6db4dece8263ab008f8fa0
font_01_sfnt_off00011568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7F 10628 bytes
SHA-256: 966387f6442d37f820e21632b2635d088123bc36a3ee161932ba0a6b2724805b