Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ee660b56f119d6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 23:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbb36930537b8e93b4349c82c16dc682 SHA-1: 0ec18ccbe784466392e56db0742c9c2fc48759c1 SHA-256: b2ee660b56f119d66854cc73fd4cb3d66f5480024477f69c4d529a8b9fd81489
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The PDF was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. The heuristic 'SE_MFA_LURE' indicates the document is designed to harvest credentials by mimicking multi-factor authentication prompts. Numerous URLs were extracted, many pointing to compromised WordPress sites, suggesting a link farm used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310257c1867---jesetilulolamowed.pdf In PDF document text
    • http://atsrealtyvietnam.com/upload/files/72652975319.pdfIn PDF document text
    • http://vaithun.net/upload/files/57641931365.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/13559523986.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109021807449317.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/926ce449280d6dc6b7612f3d1f339453/75469770162.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/vefogidopix.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/zafidurorol.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/08373cd76dc3af6696b84cfc4d264fcf/zologivuwiweparixad.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/97495720986.pdfIn PDF document text
    • http://arablift.net/userfiles/file/jigurizexepigexojixom.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/joxubunumolusalaxotawo.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/95534825038.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b4cb77fd---55518559012.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/sepifafimexamu.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/35667189237.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/vubolapivuwef.pdfIn PDF document text
    • http://hanifeugur.com/image/files/61618971964.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5dbd97331e205e1be44995ba9df4c09d/peduja.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/46249100813.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/43334217030.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/6437988951.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/wumilujuxutisenedive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=power+toggles+androidPDF 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_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 17512 bytes
SHA-256: 9f1dd5c8be7b8bf5905215621782cdd9eccd24b9067f98d4e883efd21fc3a771
font_01_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 10508 bytes
SHA-256: 9f5c7e6894efb48b0831992edb999a0bf3e6d624a0a9606e0428c133acd8d4f5
font_02_sfnt_off00011be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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