Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba91882ff12fc9c…

MALICIOUS

PDF

63.7 KB Created: 2021-10-06 19:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d54e50d53370d4c24f7ca658b89f59aa SHA-1: fe75a4e3214a5efd45e30704e4c879bb848b773b SHA-256: dba91882ff12fc9ca66fa50ac3a8e86145d5582bda3db8f2171fcc61128c810f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The file's structure and URL patterns align with common tactics for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6776

Heuristics 5

  • 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
  • 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://wastran.ru/uplcv?utm_term=physical+education+book+for+class+11+cbse+pdf+download PDF link annotation
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/sekegij.pdfIn PDF document text
    • https://tessuno.com/upload/files/613edb065c840.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614fe6857e22c---68477340310.pdfIn PDF document text
    • http://partnercable.com/files/mibekozefezevajevir.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/kibenotabujabanifirax.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/27177068484.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wabepuvadevilipulu.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/57146120959.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///dirojemipexelekometet.pdfIn PDF document text
    • https://ratoempat.com/contents/files/56538825025.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/47081224453.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/jajekojosajizeselekoxun.pdfIn PDF document text
    • https://agrando.cz/files/file/zaxuvoxosiwo.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/32649606109.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/35322033932.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133216d8cb74---norewulezividopemegufuwu.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/kadusifexifepipewuninitet.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/45278307527.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/72603362364.pdfIn PDF document text
    • https://lorrainezammit.com/files/file/19681016300.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/76606258059.pdfIn PDF document text
    • https://bor-diing.com/upload/files/30668895426.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c9d9c774a3---60487198668.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/19478047896.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/zunovu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BA 16140 bytes
SHA-256: 3a5eca91a112ed6fa0b6500e8c090cb63398ad21bbfc35cf74099794842be6f3
font_01_sfnt_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 11300 bytes
SHA-256: 4c1c16045b9cc1bf03f41a6b54b6c8c536b8a04b3dd933954850522db2d1487f