Malicious PDF — malware analysis report

Static analysis result for SHA-256 e951f944876629ff…

MALICIOUS

PDF

81.0 KB Created: 2021-10-08 11:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d1dd96949333eb91dd5072ba9c6b5073 SHA-1: 5cb6faf4390cb3a3fb405eb88b7a6266ed06752f SHA-256: e951f944876629ffcabfba8e3b9299e8dedef5e8e3c7ebc8a04a6a77d732ca4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://smidgel.ru/uplcv?utm_term=free+fire+2017 PDF link annotation
    • http://phayaotechno.com/UserFiles/File/mewubafoxisolezawidak.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/83414737300.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/3e7bb6dda33a8d943d84f9f11966d23c/wufijejisanuwezuvu.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/kivuxifogozesemusetar.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/2862087323.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/mibegidudojuwizebi.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb7010222---8500285926.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/36581744888.pdfIn PDF document text
    • http://etspak.com/survey/userfiles/files/31831570954.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109021802216788.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/nusogalokosilizo.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/busuxowibalazejadozavin.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/38116861816.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/9156319075.pdfIn PDF document text
    • http://ombs.ru/uploads/files/buvufuzinitutire.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210912_4FB546D5F02C7317.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/9467a6hdmqodf0n5lavchvpu36/zimudoxadaloso.pdfIn PDF document text
    • https://yodobashi-church.com/bamatinejobobupafatiti.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/99e951e028aec91daf30e40e26ca7f92/26542280768.pdfIn PDF document text
    • https://isleo.com/i_photos/file/67701954541.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/1117609716.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/kewejosizimukog.pdfIn PDF document text
    • 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_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 18328 bytes
SHA-256: dbc2f1a129682858c3d9889f25e95a501807de4ce3cf1182412d70baa1b869d0
font_01_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 9828 bytes
SHA-256: 054396f55052e3ea36d250269b01ace96976f53a24e783e98b6a5efd1fcff00e
font_02_sfnt_off00011ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1