Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2522cd677495e8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 13:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1ee5128d9683b454cb5e6c1a306fc106 SHA-1: 2a83bb7e105148a1f7069e8d94d8311440a3f23f SHA-256: 5b2522cd677495e8591636c878d3f18c09cf7d3d9151c3aa0761815834bbff4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • 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://synerhu.ru/uplcv?utm_term=queen+movie+online+mx+player PDF link annotation
    • http://peknanevesta.sk/media/file/3450173415.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/39640692506.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/mewadagowasa.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/27117018991.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161417a115c494---81864873880.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/10092518151.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/nawegi.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/zumuwanovi.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/15052021336.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/bolasapo.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e3a1dbcfae6d5230d9f4946dc6455e60/ratudujajepixekotadovef.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/legexikimogurakukul.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/fipaked.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/33285027865.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/9c4b14818e4fb8baf6790dbe2f240383/tusaz.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1098360b6---vuruwadekemop.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/83864541980.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/lexidejonaremaluzesid.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/598499857.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/midizi.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/laxub.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/93598540403.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/50ebf5b693c04305b9392a285f24ecd3/dejonupavozajafaroz.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/35235427186.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/53738643969.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_off0000d6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 10588 bytes
SHA-256: cadea45d7e383a2c9b53b4e9db25a3b8acbb3a5c2e74ca819b13580f440fe461
font_01_sfnt_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 17272 bytes
SHA-256: 417da1882d1e3861ed710edf0fb0f9a285b975331965c62f09209767212046c8
font_02_sfnt_off00011b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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