Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cd3473f32d8568…

MALICIOUS

PDF

107.7 KB Created: 2021-09-13 18:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7af8aaf9f8aa78604aa511166690695b SHA-1: 796dfb0aee00c131c1fbf7908855bf6e4de912bb SHA-256: b5cd3473f32d8568a87400376cf1f5e5a8cc82283f4c7cd5461b98af02750eb8
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a phishing lure. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to solicit sensitive recovery secrets or private keys from the user. The numerous embedded URLs, many pointing to compromised or disposable hosting, suggest a link farm designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://catamma.ru/uplcv?utm_term=android+studio+best+theme PDF link annotation
    • http://www.ez4parcel.net/upfile/files/2021/09/12/xosumomaxiri.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5lgcv4e5phsfakd5b3558isepq/71992665469.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/dumeraxoxo.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/73262609393.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55892001874.pdfIn PDF document text
    • http://techmechengineers.com/uploads/gujatukuduret.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/fawumoxebolej.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/kazarezigo.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/feguwanizalu.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/tawesob.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/pogafirab.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/xajasumal.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/51155472853.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/fegisalagurapugitoraje.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba7fa4b537---turuwinamatenidone.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/kikekub.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/butezuvobikarik.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/gevibidazu.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f644a766b8---binukafij.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210908150115.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/teligufemalikofebapuva.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_off00013ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF5 10524 bytes
SHA-256: f3fa04296651fb3e7d6359030ad6c29f416537c0406aa954563397921e946223
font_01_sfnt_off000156c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED2 19328 bytes
SHA-256: 29080f59fb6cf299209208dffc85f6d853e7dc66b8d5c838de95a7fb2c35e633

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