Malicious PDF — malware analysis report

Static analysis result for SHA-256 4376d5fd594bdbdc…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 02:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54019557b7cd5c470c71d98873a994db SHA-1: 5e32ba5501ac3b8348abe97d332b035d82117bd6 SHA-256: 4376d5fd594bdbdccb51883736798e27b0121041ccff8cd91eeb46fad5a4ed6b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to facilitate the download of a second-stage payload. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document instructs users to open a password-protected archive, a common tactic to bypass initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://smidgel.ru/uplcv?utm_term=como+desactivar+servicios+de+google+play+android PDF link annotation
    • http://amuseonline.com/absite/userfiles/file/pekota.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/13436626915.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109042005528801.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/dekevew.pdfIn PDF document text
    • https://inks.bg/userfiles/file/monexojilage.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/36612524870.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/65187332187.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/27568160415.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/e01a20c8aabb33c139a35f5234bb2121/6453658086.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161349532d2bc6---dagudulerezepowit.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210907184853655.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/wonedadubonasowidovero.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021091023383922448.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/kuvozakiwixiwigesuvoma.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090306041336.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/gozimutivalepikuzifom.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/68258569030.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/baa3bf31cb4470b4a7d370107adcd3d2/jemot.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/werifugugur.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///pexetomizupusini.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388f52734b9---wimututatudesosenovup.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434b54a82bb---74374384499.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/79655775314.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/62345820865.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/abf411a03573aa4469ec15f9970123db/bijakurulopusifuva.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_off0000bbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E4 11068 bytes
SHA-256: 1ace7a76f30f908bd820dfddc2cec6e768ac09c22a96b5071b41ac0dbfc41e3f
font_02_sfnt_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 17416 bytes
SHA-256: 2c1c26a1ecab3a5c6184debfb85f5a93c7f56893ebb1539dadc50b4b9359bd16

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