Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcab7463f06bda94…

MALICIOUS

PDF

79.6 KB Created: 2021-08-18 20:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 29d1995efe1f651abe4a6a43d0153f99 SHA-1: 80bea6fcb2431e769597a3221ffcdd306904033d SHA-256: fcab7463f06bda94881b40a58dcd07e401cedd18c06034c14475ef12df874c53
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may also instruct users to open a password-protected archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=audio+visualizer+after+effects+template PDF link annotation
    • http://itkaufmann.com/images/fckimages/file/35706178360.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/89004321065.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111e9de8515e---92877752457.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/46121837697.pdfIn PDF document text
    • http://fvhs1970.com/clients/876770/File/29371303641.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/81319677481.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/adc5302adc129ccc79f1c50478bf4e5a/78576252595.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160736ab546cd0---vurev.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/be019cfdde841368ded4742b1b90c6c1/65799356089.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f88cd7ca7d2---lazirekosarefetozozis.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/mamifun.pdfIn PDF document text
    • http://rjt1.org/upload/files/mijitepuwimego.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/89206ff12e42ec250c09f2f9018bcf89/21868445177.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/73418518633.pdfIn PDF document text
    • http://fitviewer.de/files/file/vomolubef.pdfIn PDF document text
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/xatokitimamuje.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b321a8c8---bogavetubogu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e04fa88e1f1---28294964888.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831020d421---84456984407.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/titig.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/72318641459.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be504edfcdf---1220708942.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/gobapojezi.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/75006097197.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a832e74b9c3---96603542216.pdfIn PDF document text
    • https://schema.org/InStockInIn 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_off0000d03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03B 10884 bytes
SHA-256: 286771d8107e91d87aa93fb156b55e50e7dc17e86a61b0721054560e8741863f
font_01_sfnt_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 17476 bytes
SHA-256: b84e318993eb85cd1eaf33595716e527ac024913873087b9dc0ceb9f6d005fa8
font_02_sfnt_off0001178b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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