Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d681b437b41bc9b…

MALICIOUS

PDF

76.7 KB Created: 2021-09-11 02:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 352f2fb553487f0e23a939f7feb0976a SHA-1: 70bc3304a2af28149f5c489a742dcf2fed50a98c SHA-256: 9d681b437b41bc9b4c461531653f0b46fdeab0a1fde505aecaeedffb183159c5
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or malware distribution lure. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure itself is also noted as a link farm, further supporting its role in directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sistemagestiondpr.com/userfiles/file/80363864865.pdf In PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/29346980907.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/2607254582.pdfIn PDF document text
    • https://resicolor.com/upload/files/vuritepefovuxovu.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///dugovifif.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/419a68e3eab69d12e524dc351c674ea1/25834151460.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/0b604eced9d123aa2024480c4ae029fd/61158194158.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a30a91bb4---73639831376.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/kilejokugidobezukisarit.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff2c7f27a---51128126452.pdfIn PDF document text
    • http://yarpaket.ru/userfiles/file/kokufefupesetexaxagawavi.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210905121600.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/97854770319.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/87a30c16782b153e1ab02918852ceb29/nifirulisanipedu.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/levuviruvopepal.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/8705954676.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210908/file/82684079423.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c61fbaa85d234bb940182c4d549b4e34/dafogajuwuwu.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/93917427991.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/25851816301.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/26815757246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mediatek+smartdevice+watch+faces+iosPDF 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_off0000c7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C8 10828 bytes
SHA-256: 7b0c1ba92bce05dbb155b9d6e72c0f9be3b3d6a8f70ce24a28d55549ba7bf435
font_01_sfnt_off0000e0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 17052 bytes
SHA-256: 4c4e73818cf204009b8c9db3738f373f37d60600edb60c0e4c0d70fce1161d00
font_02_sfnt_off00010d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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