Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efd886250d53e4d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 00:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e4ae5feb9df3b15b7685d7560d64962 SHA-1: 147df9afb978280e47fe9a9b555185b2b8b7f4bf SHA-256: 6efd886250d53e4d0cec33e929e9792a498ad66e5e93e40c1910740dc602033d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to potentially compromised WordPress upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malicious content or engage in phishing. No scripts were extracted, but the structure itself is designed to facilitate the distribution of malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.deep2001.com/images/library/File/55178659485.pdf In PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/retodigezanufam.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/xodomaronixijojabugagop.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210913_114812.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/19776248043.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/51605708055.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/rizoputilen.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/3539150783.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/28856188896.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ca0ca84f4---loxeser.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/10103581666.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/movazojijopapagewofox.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/93366046032.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/44592434748.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b5eb6245a---senasemizigodasutoted.pdfIn PDF document text
    • https://egca.fr/userfiles/file/83764429909.pdfIn PDF document text
    • http://scsytech.com/upload/files/sugutog.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/42983197443.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/xafunexoj.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/9269442185.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614505c92ed43---denilusipuditizalivupem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=escape+the+night+watch+onlinePDF 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_off0000d74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74A 10624 bytes
SHA-256: c88d30191b156c8e26b9a7e1c1bc6d899728f2e1a4773860bf09adb4feb22ad1
font_01_sfnt_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 17876 bytes
SHA-256: c0c18775363dae32cac42e1c53a9e240d9e0fe0c2e3e5330c7769aa04513f84d