Malicious PDF — malware analysis report

Static analysis result for SHA-256 d680c85b7ac13d48…

MALICIOUS

PDF

76.5 KB Created: 2021-06-13 00:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c86f857712146ad4e0ace14e996dfe04 SHA-1: 30bc6e47861ad773036b9ce2e7ef1f4b019644f3 SHA-256: d680c85b7ac13d483c926c12711cfdc3aca65ac3e8da471a4e8b55b6c09a0c86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/uplcv?utm_term=living+loving+and+learning+pdf PDF link annotation
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886efebbd41---nepotovige.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1932f84f1e1a6e265e279b13ec88ce8d/23253672757.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609897e7c4dd1---28605677589.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/wavebanunimabamas.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16214436071803.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091177796d5a---7547698376.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/42055354967.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/79554828649.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd871cc3d8---44099493267.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/vibuvuseboselaxagumup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5f9c4d038---kufunemuxuxuret.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/nuxufixenobuzunetolekisiv.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/1494fe379c8bb46345cf58882e6aaa9a/weselebaroxof.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca050bd14e---4511629990.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/sewekuk.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9919c766010b24e9948ca77b6740207/vusimorifugebamokukukutu.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/n5t2gd9sb31fhst9sr0fedb1jl/miwufidonekejukag.pdfIn PDF document text
    • http://isgsrl.it/images/file/disefokixawoxijenuto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 5032 bytes
SHA-256: 248d728067154ea6c0c873cd1c08fc63a531bc641de48ab8247322eb0ee42331
font_01_sfnt_off000100a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 10660 bytes
SHA-256: 77472c6c68e6175e9687387cf8b652e71d48c2ad10905b3b5e78b79c5a26ec2e