Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb32f7acc5c7767a…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 04:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 874104154364d36a520b44560db499de SHA-1: 609e38afd1d9be3bc39a680810c65a2dcb3b04f8 SHA-256: eb32f7acc5c7767a11f609e6a9d086d04bb969366a7a3549cc00fded7f58ad4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL analysis point towards a malicious distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://digbijoynath.in/uploads/userfiles/files/5733761979.pdf In PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/zulimawagukova.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614090c8ec2d0---39999019452.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614677e3b118a---lewirurule.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/sorodawujoranaxab.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ce25e8d75b801c676a41857546be5319/56010253911.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/zelepadapaxokulerufegipu.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/83598776172.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/napanetopizi.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/panelukalido.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/77452359765.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/zakuvugudifusolakupopur.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/rerawikadejofaxovonuni.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/94436180028.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/52840248784.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410fe0815d6---39798535819.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fed880b50---42391201943.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/gepusexese.pdfIn PDF document text
    • http://compsult.net/userfiles/file/64819205863.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/32196710955.pdfIn PDF document text
    • http://idroter.org/userfiles/files/48353353591.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/davobab.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/tonujovepegedugap.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec7d06303e---vibugu.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/74846639281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=best+among+us+mod+menu+for+androidPDF 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_off0000cdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 17548 bytes
SHA-256: 7b3280263a4eab8b3cb6d93f1c272e5f53c929454d84b602a116a66ec1b9b050
font_02_sfnt_off00011398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11398 10804 bytes
SHA-256: 1cf19c3fabc811f10ed28777c8fafd26a262b49193598a5f5a2a7420dc394d1c