Malicious PDF — malware analysis report

Static analysis result for SHA-256 2159e4f2307436ef…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 04:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 005893f4dd640a5cbeb31c086e3c41bd SHA-1: a1a14f8771685081f0ec3aa4ebb3742f97652b2f SHA-256: 2159e4f2307436ef13b187c90270b8bc0ba35a8c090f58f93e81c179fdd10ce9
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting domains. The presence of a 'Download button' lure further suggests an attempt to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://eraucheta.ru/uploads/file/87082833205.pdf In PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/0a307e908f55d8160bc9e1e30870fc5f/tolanuvezalaxinopebebes.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/geruzitakejonuvopexaz.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aade765ca7f---39452172277.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/wupebevulajedobuvidupaneb.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/67acd4e1a89ee450ef2be6df1642e050/90092367871.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/fuzukozopololavo.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ade1e1796af---19858981976.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-8-16/20210816140253779064.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c585af5f439---39237639747.pdfIn PDF document text
    • http://minerva-collection.net/files/files/bupazimezibe.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4bbfb8d2838d1f831ca52b1b19500601/zifovo.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210719_055312.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088058560c3a---36479285105.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/3867427688.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/7d642dba956d1a694638f2eeaad9fcd3/28062255378.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c7cddab1993912784fee015a9ddd919b/zewezunesixomal.pdfIn PDF document text
    • http://topstec.com/d/files/risazorux.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/61510297919.pdfIn PDF document text
    • http://sns.hu/_user/file/nezerob.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/23986195362.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/08f31e67c304ada8e83861f1fb726a75/74810893760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sharepoint+online+developer+tutorial+pdfPDF 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_off0000e69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 18172 bytes
SHA-256: d0ccd90615aa38c5906f79ab8b679946b7236e38351b771149bf5d402b0c1a7d
font_01_sfnt_off0001161a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E31 10668 bytes
SHA-256: 2e71a60d204237b49b453f0c94ecdbf8d0da864df20b67900d7e3be1570ba537

Open this report in the interactive analyzer, or submit your own file for analysis.