Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c6798703a4951c…

MALICIOUS

PDF

75.0 KB Created: 2021-10-05 17:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 499cce0011d948c9be3374185a98c870 SHA-1: 03291a2ec3997ab53b82930a78cee39729dfbaec SHA-256: 52c6798703a4951c61e41e8d60b7591773698b86376cd8764533000cf812f903
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The file's structure and numerous links suggest it's designed to lure users to malicious sites.

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 https://crewmak.ru/uplcv?utm_term=42+bus+times PDF link annotation
    • http://kidsjeodo.com/images/files/52486400105.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/75330121872.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/5262232275.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210926173047_1663359169.pdfIn PDF document text
    • https://tigaintan.com/contents/files/42910231189.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/67421420923.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/78907226235.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/zixefoletobidewefirotado.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155ffba379a4---81932916690.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/61649049523.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ace01e4be4---vafawajijonef.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/27670325196.pdfIn PDF document text
    • http://z500.si/files/weziworap.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/28230982192.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb8ddaa54f.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/25058295047.pdfIn PDF document text
    • https://renteci.com/imagens/file/91056264464.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/nubiwizimap.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/mitevonijaguxikik.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/15447276114.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/dulaxezibavogut.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ab9ce1b649a1645251a50d7d50b1b197/lefajago.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c54679e3c7---tewegosonis.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_off0000c2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EF 10076 bytes
SHA-256: 2227ef40142ffabbd5f7b16f7c2ff3fc48a239a99ab6a2a41ea2674b17fe55a9
font_01_sfnt_off0000d981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 17488 bytes
SHA-256: f560e2a49843c1f533f7f68aa10711c0531feda7f8ec8a8bcfa136329f55c479