Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ae2389fb1d7466…

MALICIOUS

PDF

79.4 KB Created: 2021-09-14 04:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e78974e8c3743ce2f4ab898099c76a6 SHA-1: 35481050511f17ac191b9d6342b01ef802f20bb3 SHA-256: 34ae2389fb1d7466fe89de1110851b6104a8b2784e863bd5735a44323ebbde7c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://queure.ru/uplcv?utm_term=virtual+dj+mixer+apk+download+for+pc PDF link annotation
    • http://wxhsbl.com/ckfinder/userfiles/files/20210910_195152.pdfIn PDF document text
    • http://muszempilla.com/files/file/zufiwefidobiwolupob.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/vadedipag.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/14850875872.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210908_192624.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/92274026796.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///lupebamekakaxiwokuz.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/4f5e1f75a23acd597f264d869cf96dd5/bikekomakazekepanunogif.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/4546078774.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb92babda---89786806718.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/14106213356.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/14437590388.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/zelivuzizonifu.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/87121182497.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff01e6e9b3---11276467670.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/repuf.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/15260767652.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/88050203255.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/91255021655.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161319afe1ff17---50789339376.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/94082054774.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/wasanixowewixexozesuvafum.pdfIn PDF document text
    • http://mylodge-naoshima.com/bukeweligimi.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/27122701267.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/jotegopifurobesa.pdfIn PDF document text
    • http://quranday.org/userfiles/file/22413143414.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4a5d6c1b---10938436140.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_off0000cff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80A 11092 bytes
SHA-256: 3470bf049808e29be2797072e4eebb656c4cf63aba074469a4edde072ab74c99
font_02_sfnt_off000101e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E4 17732 bytes
SHA-256: 7d79d072aa3d3cf38aa20e0ca552f03a24f7df717b5b8e7eff208c0f3338e6ba