Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1de0c5aee03bee…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 05:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 910a52bb80a471a6d8290449b1c3ed4c SHA-1: e93dae2e31ce7b8535ced29797f32d8ecf1b90b9 SHA-256: 5a1de0c5aee03bee7c4a3459a0b95f20e2c406a59f9e8143336c6fbbf311a4b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://laborke.ru/uplcv?utm_term=tidal+hifi+apk PDF link annotation
    • http://dermatologomiguelgallego.com/miguel/fck/file/nenilakuxewoleme.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422c9307498---78868282552.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/wateveda.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/nagadovagagu.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/gomazutegapelakexoxi.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/69420778138.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/81257842981.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe66589c1---laledipobejixuvujev.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/dobem.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161418042d3ae2---lepogalagalujaxaw.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/cmp6hgpc228vf1p6m0pv6amr1l/2958923688.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/98637780439.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/3101435427.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314c8eec7b7---53236642237.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/62477408093.pdfIn PDF document text
    • https://limadelimon.com/images/file/jinebizonibowapameri.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/45306872567.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/zebobimopepipefej.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/pozufedanuw.pdfIn PDF document text
    • http://japhina.com/upload/file/68092283965.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/16223131176.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_off0000cf9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9F 18392 bytes
SHA-256: 5beda31188ce3005f5b41bda2e4e8ff6d6cdeefca64dca770c8a991671f58524
font_01_sfnt_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A5 9928 bytes
SHA-256: a4f3ab77a6c5fdc8ce3bc12b83645675f9269b6037218c60c5e465315f6d3306