Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c750e7c0ff3b97…

MALICIOUS

PDF

88.9 KB Created: 2021-09-03 03:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: adb1a5f320fb84e0a4c2bb7f65f06a27 SHA-1: a64c56bf5fa6f08f9430a13bdd608461da49e13d SHA-256: 51c750e7c0ff3b97655904420844aebd89cafda6181b86c7e0790b2630e62779
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the structure and URL analysis point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebba56951a---25065950089.pdf In PDF document text
    • http://metafelix.it/userfiles/files/75300913709.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/vizisokitifineput.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/zijoxagivaj.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/otktdb777qk8q94aou8priftv6/59576095504.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c96ca0adb4---32829878085.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611eaa7b0c19f---vexolaxobuvotike.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/5560466873.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/sagojixidetevipubujubuzev.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/81197612204.pdfIn PDF document text
    • https://luminex.pl/upload/file/77621003487.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/tanusinenedodofez.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/76030980635.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/binezomoxaki.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/73dd9de8e4f4e6cf4de96359d128e27d/69552010779.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161266994dc505---mejemezabuferujawin.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa46c8dde0---39967681256.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5dobjqut1e5gdp00rvsof786c7/30510602598.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/1984344bf3279598791bb337f8981aa6/saxup.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5nian8p029at5mef601nvts6t2/tazedekafaw.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/gazetuz.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/17298810404.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/c626cee006b9e46c8a4c08dc335ba1e2/pilisolaxufufamuduxap.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/fovijiserujuz.pdfIn PDF document text
    • http://www.heksan.com.pl/file/lipofixisiwekavusinedusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=clothes+we+wear+worksheet+for+grade+4PDF 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_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 18036 bytes
SHA-256: 30240c1c7b485122bb4f76c7585cb6efb091205d8429d07b8c589656ed820a7d
font_01_sfnt_off0001250d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250D 10724 bytes
SHA-256: 44a8f17f4563a2538a154f18fb5801e9c1e31402929342f433337f803afb5ef5
font_02_sfnt_off00013dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1