Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e2b4a23669817a…

MALICIOUS

PDF

87.8 KB Created: 2021-09-09 17:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec1e8591050d36a3089b10908fd2be22 SHA-1: 6ce7795c96e1adf4bc8ee424544b745c6b187ef6 SHA-256: b7e2b4a23669817a7d74ffdb0c90e4b07d83305cbab5a2d48afe68fe0de20c62
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while numerous, do not provide specific content, but their association with link farms and compromised sites strongly suggests a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://yujinpharma.com/upload/files/17697428169.pdf In PDF document text
    • https://gbagencement.fr/uploads/file/66666239384.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/panedeb.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vagipotimepurofadunima.pdfIn PDF document text
    • http://didopack.com/files/sikefopimutoruguba.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/99682511916.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/cf8d43678236bbdb1f16cc87cc7afa7e/tijunofikolorim.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/vizirudi.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/gomemesisaluzatibukifexo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382c1419496---72975862886.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/pepibefep.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/69276446735.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/38580235107.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/14785829995.pdfIn PDF document text
    • http://orenprom.com/img/account/file/zovuxuvudobifuxozuj.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210903210650.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/f1bf76ca9e73a9f775924425555da094/kurefujol.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/gugosiwuk.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/44601034824.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/zinofule.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/zubepikediwazosufutut.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109081949174358.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/83343468097.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7a5c703a---jetijib.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e7105b36---61603750512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=red+queen+read+onlinePDF 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_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 10264 bytes
SHA-256: 874519ab52e76cfffdc9e0afa2105e21fdb812a48bb3b4abdeae016c17e87c01
font_02_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 18564 bytes
SHA-256: 85ebff5dfa9113303ae16b7abb15938059dc5375e13c4ee8039f19b80cfcf2df

Open this report in the interactive analyzer, or submit your own file for analysis.