Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08af72f65987f25…

MALICIOUS

PDF

95.5 KB Created: 2021-09-14 04:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0724e3651cda5a3537f0d25b180305ae SHA-1: 32b33024c0ad9aed2f8cea70c860a4a04041fb24 SHA-256: f08af72f65987f2526523f86faba34e8662524c2965a365d5111b85e47697f54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though obfuscated, indicates potential for further malicious actions like downloading second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 https://synerhu.ru/uplcv?utm_term=the+21+irrefutable+laws+of+leadership+pdf+free PDF link annotation
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161380da66f82a---natuti.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202199128261655.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/zaritizokomevutiduxeju.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/23984144950.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/75677980538.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e4c17b7d03e6fcdb241bc54afc21f221/xusanagubapexumuge.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/kejivume.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/21723949561.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/7knnrp4v1s39o713d1on0q1dc3/36643355457.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/68277999856.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/75321746450.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d08cd6a32a044fc464cc92c27cd2b0e9/68649089585.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/13167554496.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/darelonizogomawobeb.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/fanixikorija.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/pirogim.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/3106fc608fe336eeabff488ab6c90d8c/zozefiloxorezeximogum.pdfIn PDF document text
    • http://teplospectr.ru/images/files/2654210820.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/15869008712.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/bibex.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16310844390084.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/81267146003.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/rikuvesivelofomonef.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210913032506.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d059745acf---vetugux.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/20490475219.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_off00010f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4E 10952 bytes
SHA-256: a53d58dd8deab121c3e11014299db91a5e3e5351ac5a0301ce6178c80e11dcc6
font_01_sfnt_off000128bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BB 18396 bytes
SHA-256: c741e00978e5596ec6c366872e3b841dad35d2d35baa4f23d38d12189f316cc6
font_02_sfnt_off000157aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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