Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5cabd4a1dd3457…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 22:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 661dd18b7b61ed00257320d833ad2d83 SHA-1: e189e78fe53b7b762a5c8c9953aa6f59c27e7c12 SHA-256: bd5cabd4a1dd3457e901aea6775afb10c9350ee8af841ea9edd7e6c5efb2875f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that function as a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an intent to phish or redirect users to malicious content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://cructi.ru/uplcv?utm_term=watch+coco+movie+free PDF link annotation
    • https://bunian-co.com/other_files/File/90200981512.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/bezesabuvo.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///marirujevanidebajisav.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/bosipanidapewiva.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136ba55b395a---9230426141.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/kazuwije.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/55793882641.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/posunufarogozekekazujos.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/dqh98q047h5iu4hmsu7fp46feo/41011691988.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/96930425150.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b38b4d9fd7---widetof.pdfIn PDF document text
    • http://www.pilartangguh.com/file/bazesifuxagizoluz.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/xaxubojoxo.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613381858f4e6---14637985091.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/88893423679.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/50655882265.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/wakukozizukezapu.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/mevabowubevekis.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109021301349327.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/xasokodogagevatesavupusi.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161334ab480257---91347126506.pdfIn PDF document text
    • http://wenxuezj.com/images/File/38580279597.pdfIn PDF document text
    • http://grupophi.es/uploads/files/diromexupaxuvasosuna.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_off0000e9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FC 10344 bytes
SHA-256: 2b43243d223bda6be4baead9b78647dfff656f85626be8e905eddf0688323315
font_01_sfnt_off00010162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10162 17328 bytes
SHA-256: de38d46ff2d22a99c6e1e818e51bf88f308670505259afa193279fbf0d689fc8
font_02_sfnt_off00012dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1