Malicious PDF — malware analysis report

Static analysis result for SHA-256 779128a6140c3bf5…

MALICIOUS

PDF

85.7 KB Created: 2021-09-04 22:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3c115bd907bd59ad3ca880667de9963 SHA-1: 6f8662fba322192abcf9e724eeb9675f88e4c274 SHA-256: 779128a6140c3bf5af5bc6e7da66d34009d910bd0329ffad0b01ac71290b8542
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and the 'link farm' heuristic indicate a strong likelihood of redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/dbrq4i88pdjiqup2ulf3i5sub5/7822324524.pdf In PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d545f5e65afd84c50a18d303db431403/vudokutemum.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adc61fee228---9775004653.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1a48fbdca61d2f4f40029e9fa4c5dc21/68649362271.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/2abfd6fc29efc5da24a21ba8fceaf9f9/2299100454.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/87358362982.pdfIn PDF document text
    • http://ledins.lv/cms/file/vutasewegisebejabu.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/f2ngg84nv7a569juuc442g1iie/gajebawefudejikogewan.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/69650799164.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7deee56a988f19a2c3f4da382c1a3a6a/rewasujodib.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/360v6bbqe1rbv5tiqghuar114k/jelux.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/73931520245.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/80985389257.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/terabusigu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b98871c3dec---dopubisamobixe.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/retiginalebi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/49670089976.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/f6851b18dc007953a11b7344b17c6060/13765443676.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/vugorimolowakifarepifimu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/431b58b32e8321e6c17c84f7a6a6c6cd/19501671907.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/759ca106114ac227d51abdc2a0f718e7/72031436180.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/47886175204.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10713446563.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/45450594128.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/veziwebalenoxenapaxome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=epl+fixtures+2017%2F18+pdfPDF link annotation
    • 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_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 16724 bytes
SHA-256: 43142ccb2feae75c67b580d173f89426f89b325ee92b86b47553d12a3780fdc7
font_02_sfnt_off00012f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F56 10876 bytes
SHA-256: 6622028ce8cb7d3e676e83d5b9a63a4399ebf60a3b6a43c5ca7647e664375c6e