Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c9402820d42b54…

MALICIOUS

PDF

128.2 KB Created: 2021-09-04 05:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe7faf08642054e9a456837d9bea9bd9 SHA-1: f54742877bc87e8d2a555b1157c7bcf71fcfb84f SHA-256: a4c9402820d42b540926196839e3dcbac4d1cce70d8a8d5ae351ef60d91935d1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload directories and disposable hosting domains, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs further supports its role as a distribution point for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.ez4parcel.net/upfile/files/2021/09/01/51439907832.pdf In PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/8c916d99ec5c2b8fff57c7362e735e7c/vufefe.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/lozofobejut.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/dd8645bd98a16c339cce5a74373078c1/40987008968.pdfIn PDF document text
    • http://apvn.info/userfiles/file/kobekuxudis.pdfIn PDF document text
    • http://calisnt.com/uploads/files/kubugakotixob.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/50287515431.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/dazitazaxafow.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3343121bfb---57858509422.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/9010590245.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///vanovaxutemukemokamuzav.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/38876916148.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/wisuniwurad.pdfIn PDF document text
    • http://firegallery.ru/img/upload/31251213304.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/xabomigaxugubofovefu.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/gazamudu.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/53028215008.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161001ea8a58f4---74106610588.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/12396609282.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c536bab6079e8e47cf035227a626bc3c/mituwi.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160819f17ccef9---baxizozivil.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/xopopakemigado.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/a2qn82bvspipnogvt56ctci9d4/99064831796.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/tirizalavevemilov.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/7d3b2b1ace60c9af6109f1a5ca591eab/68231881123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=manual+walkie+talkie+midland+g7PDF 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_off000187ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FDC 22536 bytes
SHA-256: 6cf262e7fdd241e8094ebe40b59c672604528add60e9c653c9aec00d2c517f96
font_02_sfnt_off0001daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAEF 10524 bytes
SHA-256: 786fd9730532385915cf146b65d56cb06a21a2ad79e2ffd042d34404d35e593b

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