Malicious PDF — malware analysis report

Static analysis result for SHA-256 652bb5ae154e73c5…

MALICIOUS

PDF

70.1 KB Created: 2021-10-02 17:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 09a8e4d981c5dd531e41a78acfa5313b SHA-1: 4f212b3ed540e0a3b4a6bb1986108f850dedbdf8 SHA-256: 652bb5ae154e73c50b23e35905bc9721a504247a73f00c528bc59c087cd9a1fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the PDF is designed to lure users through deceptive content and redirect them to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://sriagasthiyarastro.com/FCKeditor/userfiles/file/kakaba.pdf In PDF document text
    • http://pitin-akutsu.com/js/upload/files/81269000238.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613695fbba440---tefuxokakimajifesosi.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/kokexovufoxexativar.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/rojafepuwosomiporatuna.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/bumigelam.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/lugubukitik.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/80376581964.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/94665965148.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/sapafipepe.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161439831a2c03---75719312069.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/73290384122.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/35730028673.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/gigorejamifopejevimuf.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/nugejepujopumalob.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/vuwupunuzukikimam.pdfIn PDF document text
    • http://spakimthi.com/upload/files/84124364418.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/tomopawukasexes.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/rigunuguxafesaga.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135741ead1ca---64163879737.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aea47998db---4391671237.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/jivavoze.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ab493e746---zunugaruvurugumuzapefo.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d273ed6930---kodoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fruit+trees+in+greenhouse+stardewPDF 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_off0000b3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B8 15220 bytes
SHA-256: 087a21ce8154cb781d081b047a96fb2a5f67aeb371778d8bd1b1e57906a9afec
font_01_sfnt_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 10644 bytes
SHA-256: 195b5fee2e756f883ddfecfbc85fc74dbc6301190b72a0bbf1940d6e26ce02aa

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