Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ebc08059f29f8f2…

MALICIOUS

PDF

73.5 KB Created: 2021-09-18 12:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 66af7d48aff9b4cfebc2d553cef9bb08 SHA-1: 67ca7bca792d3539473dd00f20d860bf291b8feb SHA-256: 2ebc08059f29f8f260149b6bfb3c05cb02430192351ff14dd41e4e3c31eeaf04
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is obfuscated and does not provide direct clues, but the heuristic firings and numerous unknown reputation URLs suggest a redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mebelhotel.ru/images/news/file/90384175324.pdf In PDF document text
    • http://automsystem.com/UploadFile/file/20210903181648094.pdfIn PDF document text
    • http://erdbau-rauch.at/50318595198.pdfIn PDF document text
    • https://stvietnam.net/luutru/files/zolanixumojikabisinijod.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/17992918649.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/mozopiguziji.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/8701831811.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/18844542389.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/rofavumixixanarofo.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/pabiladofe.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/batufuwasatov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e07b5d9581---76629887141.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/67379460239.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ps9c848lm06ahpefe6c4iamoel/71410481889.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/17793974460.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/31543321511.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/gogifedexezadagipunebaras.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/gazugarakigiler.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/luvin.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/wemedenixat.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/zezovi.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/40866279744.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/16107770830.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/monifolovop.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161344618c1ca8---kimizupuvelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+can+i+get+my+deleted+photos+back+on+my+phonePDF 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_off0000b9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD200 11284 bytes
SHA-256: 838413b61b4b32fcc3eb143680cb40235159779032df7bfe2681efed249257d4
font_02_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 17204 bytes
SHA-256: 0a2232c4a40e4c968cd729fa5be3e4070f7c0d8df3237c5276b6b87a1ac133d4