Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd31861619e31594…

MALICIOUS

PDF

73.0 KB Created: 2021-09-04 18:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 59f478244f0a783991234349e05c3639 SHA-1: 21bc6491a8aaf49e9ac62d403275216d0372b0c2 SHA-256: bd31861619e31594decd5e4376291008d75ccd4df92c5bea816ebc3b27a97606
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple link farms and compromised CMS uploads reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/ In PDF document text
    • https://laser123.com/geektic/files/guletiliwokan.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/83951521167.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0eeba704---60897638935.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cb0469035---kulezojewogidow.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/99970739346.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/24425840075.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/puzakubofutukot.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/xasotisajej.pdfIn PDF document text
    • https://fultoys.com/userfiles/34652168789.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b29c0b860d221b0f6c9ef949a4731708/98764047769.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088ccb2e4ae4---kegoleziferoxo.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/43309666726.pdfIn PDF document text
    • http://samtle.net/ckupload/files/pomosabudetazovesawak.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/kisixarugigiwozav.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bae1a5314---koxufodetukemutade.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/85869c254d0dfba6aa8c890d8b5a7131/wugoguwetutu.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/36001632128.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/tifavoveta.pdfIn PDF document text
    • https://rubfila.in/files/file/99446457995.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021615015337036.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9809f61ce1---92542448777.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc75b153ba7---16694995303.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19068e514---55530489518.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/daxurajalaxolowodikedita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=oxford+dictionary+phrasal+verbs+pdfPDF 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_off0000b754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB754 11164 bytes
SHA-256: bf713e200c85bcb2df3d5e6b15ee69a193afd4a32ff26bc2ca91a846d6021dff
font_01_sfnt_off0000d135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 17716 bytes
SHA-256: e4bec7df20c3b3b59e5c05c867fc29faa5f96cd702a79c376d9439eb5dccaf15