Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7255a52338beeff…

MALICIOUS

PDF

77.3 KB Created: 2021-09-20 00:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a5350bd2797dfad1012e95f1a51c9f64 SHA-1: e8bccff34e59b0d4a8745baa6e9c5f90c23604d1 SHA-256: e7255a52338beeff783807b845a1f1f07897be7efd5b0701a8e4c9246ba967b3
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and multiple external links, some pointing to compromised CMS upload storage and disposable hosting, suggesting it's part of a phishing or malware distribution scheme. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://allytemp.ru/uplcv?utm_term=black+hole+hero+apk+download PDF link annotation
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/80937413892.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/33630463506.pdfIn PDF document text
    • http://peak-experience-japan.fr/images/blog/file/78002543428.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/76778098635.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/1472654767.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139c7041b59d---bobexaguxulidopapanuwu.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/molixutole.pdfIn PDF document text
    • http://webursitet.org/Files/file/63678692683.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/losedoguwowibutofese.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a6d727461f42ee52edb2a0ea8197f1ab/fasuxoxibatadebop.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/kubatutipezu.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/tulujoson.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/bekenolugetopufivosu.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/jajomosuvalimu.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210912040940_k79gw0.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/fagizilazuzusiranepexa.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/nefakomameraziwego.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/89666623580.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/30136138640.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/bojezitobokiginefe.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109081650477494.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/in1t681bhsrf5cii49i7icve7n/lagasovobodutimojikavufen.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A5 10484 bytes
SHA-256: 8379edce99874faa918cb1043165fac342d1d647fa6843e648566ee25c38a4d5
font_01_sfnt_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 18208 bytes
SHA-256: 1a2e28635d8533e1a14c8ac27cb918f944c3826857138bd6f8b48bf6d0ad73dd

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