Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb241a3c8770a3e4…

MALICIOUS

PDF

88.2 KB Created: 2021-09-02 07:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b55a4268e17a1af4523cc1d73d703a0f SHA-1: 22d732212066fff37a3c7bfa0f7703f2c15b0c4e SHA-256: eb241a3c8770a3e4c07219b752f392c6e14c35e1d05d091cd8ae8ab4a7b1f923
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://hoanggiaphatstone.com/upload/files/92882259886.pdf In PDF document text
    • http://kodemari.info/data/files/14438118012.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/g4cchjq62cvnendnlch4mousg7/kuvoginexikesoposilixu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/8eb0275319ff6111c0503cb931cf446f/pimokoromexi.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/70096424862.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078de5100c97---89085346988.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b546cf90fe58791c2792066a1751e2f6/61139095617.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/a8i900sl3dkoflfi95hck951lk/21222010164.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/5396639836.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/d28e19fde85899dc6611a2a9f760f91a/fifis.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/76022401072.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b1940d32b54---23566326080.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pn6aisedc0j0n1qu017ejjmve7/pubasor.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160875fd9e3b0a---79793892371.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/68230743958.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b8b8b655c---20066080127.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/wosobaxitigutopojomemim.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/47847441872.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/181ea06ea999b8ec62c068642f653f46/57734370974.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c350e1702---28171535613.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/56986772986.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/kobovozurafop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bible+verses+about+being+the+light+and+salt+of+the+worldPDF 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_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 11080 bytes
SHA-256: cf21063cf6ddd33ef3d73c9a850d3ef19f5b6be89c60a8f5d01fd5c9ccb69a2a
font_01_sfnt_off00010974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10974 19000 bytes
SHA-256: 1644e7f912bc4b912f4b8453f695fa8f3dcd6db997a364e031957a02dc604be9
font_02_sfnt_off00013a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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