Malicious PDF — malware analysis report

Static analysis result for SHA-256 16985d9722a43be4…

MALICIOUS

PDF

86.3 KB Created: 2021-07-09 01:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ac053f3609cc1046f87cc9f55520faed SHA-1: 0e8d26d86a7ccea89917dfbb552ce9c042372853 SHA-256: 16985d9722a43be4e970997ed72a3e4b690329e9ca8365d8214ef4f885e9562c
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites and other potentially untrustworthy domains. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users. No scripts were extracted, but the primary function appears to be redirection to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2d74a08a400662f2f05b022935a5b707/11979060091.pdf In PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/zaxuxe.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/51607459015.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/51c4409f60e458150cb56c6f9a917b98/tetizesufapafo.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/bubojavulekudabet.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c560852780d---supojesevoladitilokape.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d83e1029d---dojeduwavojofutuf.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/63498430825.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/lltme3sngc9lvh8eac0cgtpvm5/rasawazazomujajomej.pdfIn PDF document text
    • http://haphadoor.com/upload/files/49968822049.pdfIn PDF document text
    • http://armanetti.com/images/wetazodufaros.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/gcg7ju0djnojqg0m67f1vc942t/xukewadawodafasevigekewex.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07cae5b7a2---divimu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a399336a936---5883134909.pdfIn PDF document text
    • http://cycling-software.com/files/file/95840380453.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/16165351934.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c062cd118---tibafafinusedujero.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/9611389547.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/94505193142.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/zepodukaba.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed1f22698---namalegidomevibiw.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/tovuboviverem.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/pubafade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=notes+of+economics+class+10+chapter+1PDF 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_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 17904 bytes
SHA-256: 856888117a4051a9273d8f8cf87b5ee6827d39f2eca235c7c4c4287fda5c236c
font_02_sfnt_off0001330f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330F 10896 bytes
SHA-256: d6c473303a909600523ec29a8af17e7ce970410b603228963988cb1dc5e1640b

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