Malicious PDF — malware analysis report

Static analysis result for SHA-256 909ebb84063a8344…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 13:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e69ce943aa6c61a25cbac6af19cac820 SHA-1: a31654dc956c8ea073535bb88f7357362cc18130 SHA-256: 909ebb84063a8344a216c0254465f2e80ca5b5ceccdcba18f8e4c3a29f5081d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous other PDF files, many hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farms suggests an attempt to obscure the ultimate destination or to distribute malicious content across various compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://media-get.ru/userfiles/files/muwebanixamemevisimiwi.pdf In PDF document text
    • https://triyoga-tv.ru/userfiles/file/43422848598.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/2fsdvovdjkf35k0v7l71msgfo6/mizukitigalodoxenobulibom.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/21204958976133bba6b50a0.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210903095528.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/vokidorijasiz.pdfIn PDF document text
    • http://www.grifin.sk/files/92135125378.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d1df18157e396c41efd1290cea5a3257/mutaxu.pdfIn PDF document text
    • http://hoachattn.com/image/files/25253147541.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8895676227.pdfIn PDF document text
    • http://prompol.com/media/file/9854849110.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/xurewakotutufobupi.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/piwobip.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/8609588829.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/58623033529.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210905_012517.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/d6919cbeec1217e79348b2a0594676ae/30796798953.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613336bfb7e78---kaleku.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/90131245397.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/fuxuvumavumorobedimon.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/melexi.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/93821991698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=app+is+not+installed+android+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_off0000da32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 17300 bytes
SHA-256: 33db222c3ae75422b930dc9877b99cfeb8c9d5bfdd248bbf37655ad6592456a9
font_01_sfnt_off0001070b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F22 10456 bytes
SHA-256: bc89f40cb97f25adbf3e5fdd80085d9609bdcba11ad9eaa63d6ab2ba209679b6