Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4e768a9ba0e85f…

MALICIOUS

PDF

87.6 KB Created: 2021-08-15 14:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a48bd8aa77d8b3317422334101e196c SHA-1: b14b6e4d90672c29dc1b21f6e83cf7550ea2d1e8 SHA-256: 7b4e768a9ba0e85faa7aca4fe5451913f5f2801ba54278c4993875b9e71bd829
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, including some hosted on compromised CMS uploads. The presence of these links suggests an attempt to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/hb5mcctugv743612id0rfr59ra/8633962627.pdf In PDF document text
    • https://airbays.com/userfiles/file/rovinilude.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/34630277352.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/fuluf.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/d43hldm1cgnolr44qnag4n2lv5/72829143215.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/86040554590.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6485ca50e---boropaduxe.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/paxejutoj.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/rr59bddhdruq0qht8vhsimo6u5/4065008371.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/58823024546.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/83519614343.pdfIn PDF document text
    • http://amdind.com/userfiles/file/53087880725.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/f8q6um4a7j1lrg3rk9djbk21k1/lalenuliduduma.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/pubagorokuwe.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b3ab1b38b046e57e5c18e4497e7f1304/zibapuzukawipaju.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/nopegen.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/97023422365.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/bunimabita.pdfIn PDF document text
    • http://valeneighbors.com/userimages/vadirudetisifazo.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160afca396fa81---97644242391.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ev8ilhjq0frosg3bnrkt8chhig/xejukuva.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/71209923739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=why+does+my+quadra+fire+pellet+stove+keep+shutting+offPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0cc17adf6500538098926e9c982d4c54/25426342429.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_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 11456 bytes
SHA-256: 9c98f233e44817adfb99f498ccb3217709f04fb0d61b932f3ab72320018479da
font_01_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 18080 bytes
SHA-256: 361c57527fa80041d8c51b5b4fbe8aaf9a0c43633dfc50c667477e9b51006667
font_02_sfnt_off000135d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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