Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4d53a077072585…

MALICIOUS

PDF

87.8 KB Created: 2021-06-30 20:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1dc919a9405ba6822108c08309ee953f SHA-1: f225bd29a4a59b50b46d8a53230d73036ad679f1 SHA-256: 3c4d53a077072585fc4bbcba69ba616d70ea8f6ddc1f90d6bb29cfd6b7b580e8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to other PDF files hosted on various websites, many of which appear to be compromised CMS uploads. This pattern is commonly used to distribute phishing content or further stages of malware. The document body was unreadable, but the heuristics strongly suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/oflurncrri2kuta6h6s9j2fulp/3005749854.pdf In PDF document text
    • http://tgtech-auto.com/userfiles/file/zudawatikumokaxo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071e00b22665---78233388268.pdfIn PDF document text
    • http://esejsc.com/upload/files/52014345904.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4bd3fc35---bipikutizixebijositaf.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/fe56a26ff42fcc0e5f117c9a2bd2f582/lijutopesaja.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/juzaxujavutax.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/jumskbhib6ii64e919tr26d8jk/selomudakuko.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/hbbsg2lurt8o81gkjk5hibsmle/14706457800.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a5781e2e8f84f3feffdf5ac4ea216244/dusulisusuge.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/kaniwabim.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a95fac8f9ea84002c707c0ef5c42fc4a/wikunexi.pdfIn PDF document text
    • http://rafaelokazakov.com/file/70484139300.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lfbc1a7glbj3tnoijjtilf8nm6/nabilizovurarujopez.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e30792e150037fb4974c5feaaf254abc/xojezatazewebeded.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea3cf84563---37272246629.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caaefccdf9---wojifafazewep.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/4e0e37c3d16859859e61e93abcdfda89/58569387613.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/biwulizele.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/790211c197e6d59e184bda5933590cfe/pumizapunaw.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160719a5ec01ef---xodawerabupu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cd1o4v5ohhicotp2pjc8ueacg6/tokijexiwubotixu.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4976c9288e527ab70f14799a216c1c0d/nebit.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/ragovigejiwizuk.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609720349d494---223552101.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/83868406733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=3+waves+of+feminismPDF 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_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 16856 bytes
SHA-256: 9de36a9e03f745c0ebc3b69f6dff23c6b6d8e953c8d89dd8b2071f619c9f2137
font_01_sfnt_off00012145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 10356 bytes
SHA-256: c93aecc79e1c8ed7843db43a42dd2c57321527e7d3b85967c891e4fa5ed36ab5
font_02_sfnt_off000138b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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