Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbea2a66556ab16d…

MALICIOUS

PDF

77.3 KB Created: 2021-09-21 10:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d8f0b17e1bba2a3fa2e66faa91afc88 SHA-1: 87b1f56b61e74acb95f2d4cafca71b48a7d3376b SHA-256: cbea2a66556ab16d29559d1b6e99d8e04374105c66e8b99375ec1f21b15d209b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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
  • 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://powerfalcon.net/uppic/files/riwijiwokesuxewefenome.pdf In PDF document text
    • http://jump360.co/upload/files/20210918034739.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/68150042475.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/kopogumi.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/jibaxudikitorunakusi.pdfIn PDF document text
    • http://elsped.hu/files/file/99870716749.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/82841579562.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/49117140514.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/95935049949.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/789cd965bf972bf380d08a0768231abe/madelavavejifu.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/jalofukuvoxetefaw.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16321888168696.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/jereviduda.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/88362480447.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/nevukufogufo.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/27403929424.pdfIn PDF document text
    • https://slide-bearing.com/d/files/vopibavamu.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202192642640.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/ladivexukafuroj.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c05ec2226---83570135337.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210903161939-91585116306.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ed64e0b053f4b151b2181d1875d71a24/61806059151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=unable+to+start+activity+componentinfo+androidPDF 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_off0000bbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBF 22044 bytes
SHA-256: 2976cdd894eaeb5cb27bc98f1c9576daf49a9acf2000342d08f93d1bc0686be5
font_01_sfnt_off0000f5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBA 11108 bytes
SHA-256: 47b83a4629b788c63f67b8f3943eaed74af3f9d3dfa7e1785887586b15a36d7b