Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5ab7360cdee968…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 15:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af03ad487c2f5221b531e76e8354b051 SHA-1: b4676716129e7e1b975e69983754cf88a407a02e SHA-256: 2e5ab7360cdee968d4b635be762a4b1da8c76c54db5e937248e3df923d887d30
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data, suggesting the primary malicious function is the redirection via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nbcmedia.vn/ckfinder/userfiles/files/2203428960.pdf In PDF document text
    • https://istocdukkan.com/userfiles/files/botemasetirikuwotavedo.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/34273959606.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072655d12f98---10442322318.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/70761903241.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6197b47008---61539548271.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/32793752083.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/punipugodoxefi.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/72886392453.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160754716b4c6d---31135248610.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/8683e3adc261fc2de5dda5b355fd5256/67633360210.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/tugejadukibiwikizeli.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/pukitukenobotapuko.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/sft417447c1e16qfcsrkvo66dn/gezolibapalokexofufop.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/nagimepudipazajexuti.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/jovolelulixurenu.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/perudevusowikejiwudo.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210802164914375.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/zexusibutomesivubodopu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b20833a7560---97736298647.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/41464976037.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e98c028952---25585322530.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/garegemaluboxafut.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/gefivipijazowejadasep.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a359b55110d---78711447928.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/titaxefinamudunajafabogel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sailing+to+philadelphia+sheet+music+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_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 11140 bytes
SHA-256: b104bc5dc27ede6e67ae17ee2c937f431a39fec24f5246534229b3146a467473
font_01_sfnt_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 18016 bytes
SHA-256: f4fccfe29a42b1924bd7fa9504e35e68c820f67522ef68efd6b5d45ed756ad8b
font_02_sfnt_off000120c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1