Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e81453389cd4f3…

MALICIOUS

PDF

93.3 KB Created: 2021-09-21 04:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7376a5f461236bd482359181d37e75c5 SHA-1: 9ae615775aa484a82f141cab4e8843b2af6a2821 SHA-256: d5e81453389cd4f3f7e7f7c20adfd3f6a2af4da34997ae5f48c576bf6d2550e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to redirect users to malicious sites. The file's structure and the presence of external URI references suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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=zip+code+talavera+nueva+ecija PDF link annotation
    • https://trvstore.com/userfiles/file/4032965952.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/sk7eec36c2on3rdd3cauuqmpge/38581925798.pdfIn PDF document text
    • http://livestocktool.com/d/files/savedoxuzanazunexusawuf.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc4aa2008e---wodez.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/11467788695.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/gazitugujojikorutiwew.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/cb6534580f25995bcbb183ddcfb0e137/1186642690.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/pukujifinesovuribuwilazoz.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/34928785075.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/turepido.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/45215083860.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210910_0EB01A2A41C90B95.pdfIn PDF document text
    • http://health-bridge.in/upload/file/27810435132.pdfIn PDF document text
    • http://topas.lt/userfiles/file/dejulazosarakonu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133edd99db6e---58116382651.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/narefedibetawakikexuwaka.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/siwugawabalu.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210903_E3986868A82B4981.pdfIn PDF document text
    • http://totoumi.jp/upload/file/34639098834.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/63417245461.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/83413343365.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210916093308666.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/78372161241.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/448363669.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/sefasipigedifumatujaz.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/47600406034.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE960 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_01_sfnt_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 21488 bytes
SHA-256: 9112513230d50a8950d3f90bd6b173a0819e6bee388a205c8d417e1ae85f2dfa
font_02_sfnt_off0001368f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA6 10596 bytes
SHA-256: 6325f72a1d546b56740df6cc9c2e9acf227e680352652f407be10b3f80a838c5

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