Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d4ebdbcf8a1063…

MALICIOUS

PDF

75.8 KB Created: 2021-09-14 11:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4dcb89a1c6cf8cfe337085387351bce SHA-1: e50437323c4e7effccff956105b601a35d415a26 SHA-256: 91d4ebdbcf8a10632f673dca6c9055eeded4b61538c8cfc8ca69e184cf00d568
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous unknown URLs further supports its role as a lure or distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5565

Heuristics 5

  • 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
  • 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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303bb685c5a---51173366290.pdf In PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/wozeforerowe.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/713523922.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/dokalaripuveba.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e763eeae---49301690840.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/5182267000.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/67989171600.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/vatuxugudesudelawavek.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/92715333435.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bepanobifuxetateruguvum.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/82537992611.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/fuzekig.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/xoginitemuwixe.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/88988250980.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/38514569683.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/51823830378.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/80072303509.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/11100331454.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/46296812856.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/47748683536.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/patapolefijutajatew.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/xuveravokexitinepaxafasoj.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613477b6a00cd---99189414540.pdfIn PDF document text
    • http://kftchem.com/upload/files/92249013663.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/23446588021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hd+screenshot+androidPDF link annotation
    • 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_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 18000 bytes
SHA-256: a6ac53903562b5701651a4e8d9d672b713298719b23c4a5ddfdd3c9fe8c80e43
font_01_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 10412 bytes
SHA-256: 69bbd42254a23a68139cc377c180209c6b70f247aef69f8188050167622ebae2

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