Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b6d391e776229d…

MALICIOUS

PDF

69.0 KB Created: 2021-09-10 05:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b16896a4f896fd4f28f9031eaca9efe4 SHA-1: 9c70926a3f589409c5e93e92eadcf5bf88173e89 SHA-256: f7b6d391e776229d5c1fcbec86e1312bebb9d4250490c4aa4c634226845afdc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to websites that appear to be part of a link farm or hosted on compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=picsart+pro+gold+mod+apk+download PDF link annotation
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131787777724---43250498780.pdfIn PDF document text
    • https://sadex.pl/fck/file/86070197510.pdfIn PDF document text
    • https://brakos.it/file/86653944590.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/37151341515.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/10065388166.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/walela.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/6220469271.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/fevaxefebonosedutedot.pdfIn PDF document text
    • http://speckrepej.com/upload/file/74081883054.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/kv0q6hkps5h8eth2c805skkmqn/venobepazoninezozowa.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/gufez.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350dde789e4---79719120847.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/7064607425.pdfIn PDF document text
    • https://afayl.com/userfiles/file/36383051759.pdfIn PDF document text
    • http://toroisg.com/public/images/files/febade.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/gefarilametibizogikaxe.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/22937827576.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/28786893376.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/8475968267.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/68477767391.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/39628372695.pdfIn PDF document text
    • 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_off0000af74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF74 10904 bytes
SHA-256: bb5313ae639f5e5a0f9c981bf40a5434bfc6df411696664553ebe9d37989172b
font_01_sfnt_off0000c886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 15224 bytes
SHA-256: f6cfdbe28686f9b7f97b889bdd0d1f7d0d83079a2e8fb6b6cb866e83ac8e9158