Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd62dee1da08242a…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 11:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61704c18833684a46711b7d3f59facc6 SHA-1: 12146ac637817fed1ecbd630182578b76567fc47 SHA-256: cd62dee1da08242afdc8f58f2c11951a027b8cedfbf121525e94a871d851a406
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://elma-itc.ru/!upload/files/94690399315.pdf In PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/gifosujuvovi.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/29830808639.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/natirikuweke.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/reduteturifogumodizaj.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/581ea1f6cb0353ba087c96f9aa4bbbef/dibasamavinizaxowelo.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/23174424957.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/wagapu.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/46884183993.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304370d76dc---27251688303.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/nixafitumowuxi.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/36150891520.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/netesukox.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/df2bc5728e6fa68c70b63b8e3e418c72/saxub.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/7411581868.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/57765090643.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/vazamebojokotunegogaja.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/sofozaraku.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/2092014598.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614079d0e425b---99970841455.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/78665660390.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/33906748570.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/9a09fd915a56c14442e9e64d9986e21b/4632984055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=clash+of+null+download+apkPDF 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_off0000bc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41B 16376 bytes
SHA-256: 2be4dcea8220073902ca18f01869c055f52f1f8341396c98141aece7900596ee
font_02_sfnt_off0000fe13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 10480 bytes
SHA-256: 1eb7759a752f36f23dcd64e26d729ac9cdc71bcb1d695dfb4f8d727559e08574