Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfe0dcb5000f1b6…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 22:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c86cfbd9f174cda5479cf68fec1c8adb SHA-1: 6aba2484e0a8e5c626b0d989c845b7e1f07fbf3f SHA-256: dbfe0dcb5000f1b6c44b816483c6d9efd21be858fdcb4cd214a24380d9a7ed56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, indicates a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

Heuristics 7

  • 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.
  • 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.
  • 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=zack+snyder+justice+league+4k+download PDF link annotation
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/86897726982.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210905060848.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/xosegidamakelobozebive.pdfIn PDF document text
    • http://test-immo.com/file/50887503046.pdfIn PDF document text
    • https://aaaxxion.info/images/file/76311602204.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/74231762348.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/35f6lp96h3mt96rujs3ncthb96/zovemifamubom.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/kazosuganininesifinor.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/doseveboxuvaven.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/2298038468.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/16868674875.pdfIn PDF document text
    • http://saaretravel.ee/images/file/52908749772.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/wurukojusisen.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161464dcf2b0b8---90772380655.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa34f0174---kaguw.pdfIn PDF document text
    • http://cascad-trans.ru/files/40280418895.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/10586151832.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/nuxesuzujamovogowokan.pdfIn PDF document text
    • http://zuszdounky.cz/files/razedun.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/nepebelujesiz.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/rijuje.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/78118437432.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/depinizi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f116e4745---polivazifotakowejuwe.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/zoxowevuwumozekulugi.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_off0000b201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA13 17132 bytes
SHA-256: 1ed41b0e9c2ebda3d83a1e75267ecde6316a777bc047cd2df345afe361c5f215
font_02_sfnt_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 11108 bytes
SHA-256: 7dd393ea2107bf0d666c354e70bcd1aa8f4751eae2a9460c0881c12c2223059a

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