Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d2f8608604de84…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 08:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e26ce6f6344ccb7b383c6dbfd4ae2249 SHA-1: 7f45700f0570ce95a74a86bc997f1901c28b1467 SHA-256: f7d2f8608604de8443d9d822fba0d603e77dfddbd17f1e34b8986ddf01ca7a77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to disposable or compromised hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://tiszaikaland.hu/upload/file/bodevinozepojo.pdf In PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/56796980963.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/zesoxenawotunipitupugage.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/5852141981.pdfIn PDF document text
    • http://nanopena.cz/upload/file/63946483324.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/1071761016.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/xividuzesarozebonova.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/pozagemexovijonasuvoba.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/nojigobidezetezoni.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/80121221174.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/73165128097.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2c732a04e---53052136622.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/dokejanavi.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ir5gdioniv32shj1l6cub33fv5/69287796411.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f72d7fb06ffef9b69ae5b61d344d7ee0/jufujosetozaxabigobetato.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/tokane.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/virizo.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134070f69f42---13154866826.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/komewajopapowigipape.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/t5pneefodnil16j9gns16o9smk/13291633392.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/jagogefowuxasoxafixow.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210909201908.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210902_DD46D90E59181BC9.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/96749960103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=idm+lifetime+downloadPDF 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_off0000d7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AB 10284 bytes
SHA-256: 72892749adf579629a47db09dfba4b25671e99f684351d74659fd5d72c6c6a59
font_01_sfnt_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 17844 bytes
SHA-256: 1d287132664528bdd5addd1b5df0004d6c7513278b08b9e1150cefaabc41a985
font_02_sfnt_off00011d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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