Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d25d50c0f92884…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 19:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c119e8c4c616c4a765aca994e9f4c774 SHA-1: 4c4c3059200dd8f3199a7eee8c0a46fc0bb56616 SHA-256: c8d25d50c0f92884e18836303d6be430f7563cf6596756dd9b5da679cb073532
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external sites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs users to open a password-protected archive, a common method to conceal malicious payloads from initial security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=how+to+get+wifi+password+in+android PDF link annotation
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/gemegirififonopod.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/vetexumumejironufivib.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613896a0bca29---dirodo.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/nezezolefadanubobaxavave.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/56879368660.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/f67dhmnph049or0fvgfvq65o7j/rilamozin.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/84580911024.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/marasuwokibinopejavipix.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/segexepagulugomuber.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/85629605014.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/55882255629.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/puxiwexekupabed.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f9d24cbee---93211209975.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c6bf9c4cc---73334190543.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613db04668274---69244630225.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuzebovaraxuviziji.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/zovevagalibuxodotewega.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/vejagarafezeguzedu.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/dozawotiwig.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/verolagoretedovuximexovis.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/tekuso.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/jegazowomovupe.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/99878552732.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_off0000e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF936 10704 bytes
SHA-256: 4586391c8c9880212c75a05062bafb96429ea90aac638f56f36b7eebb4f2ab2b
font_02_sfnt_off000111bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BD 17868 bytes
SHA-256: 5fb43accd997638cef9a2191e178e419116075fad189d4a30da305ffd28c9029

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