Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9645984c175b8c4…

MALICIOUS

PDF

88.3 KB Created: 2021-09-18 19:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49cb398ad6b4a4bcb97e8f93a8ee7e43 SHA-1: b003a870fe6902b2a13eded9402e13710946b46f SHA-256: e9645984c175b8c46322ff79416b67a5f9111a0965110fb83eb7fc78f3fde73f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to various URLs, some of which are hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect the user to malicious content. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://phanmemerp.vn/attachment/files/fuvazotakojipebagavu.pdf In PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/86333604237.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f81ce6a2df---93112489072.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/54244925827.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161409bd672d9a---36548746109.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/wibesesefilaranote.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5a53c1eef89521af8d195740b6f72472/26232996523.pdfIn PDF document text
    • http://dd-eng.com/files/files/42468135848.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/worexu.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/76527858464.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78800641740.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/demometafekepug.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210917194450171.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/vukagamezibat.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/takirivalipororuwawo.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/12120811285.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/tapogukaxuxuxipikigeta.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/97513709757.pdfIn PDF document text
    • https://2acontractor.it/images/file/xetanimebo.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/38566430087.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210904221304546.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/82456717709.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf452e796f---78028017980.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/kopoge.pdfIn PDF document text
    • http://kleiberit.ru/files/file/31551223494.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/xeruwevawililodenefezuje.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/mofelil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=wrong+turn+6+full+hd+movie+downloadPDF 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_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 17932 bytes
SHA-256: 813a3cc799eede4ca232cbf7080b80de61461ceb87ce2419ffe277b6440f375b
font_02_sfnt_off000139b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B2 11048 bytes
SHA-256: 373880135508fdc0ceed9117279e50b178bf797dff423181e89d49f3e1c74b57