Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a0f59f45641af3…

MALICIOUS

PDF

74.7 KB Created: 2021-06-16 08:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a19b37e3efe0910a311d1a140cfe3ecc SHA-1: 8f3bf96a0e7458e4a588112e1687cb8994ae4456 SHA-256: 72a0f59f45641af3aab2db1ad7fc9b8c6895d3e669b0b210b9ff6f1b47d1a731
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/uplcv?utm_term=cyberark+dna+user+guide PDF link annotation
    • https://cualuoihoanmy.com/uploads/userfiles/file/seloxinixiti.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210613053353.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/zemomigizuxefesud.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210522081023706.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hld9bu3o7rvhfrn4d98n0lgjt5/2130366719.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/b22870e4c6857fd82cc252155556e8ea/84910883344.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754fdab7a4b---40625070746.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/meris.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/23316f917df3386d1d827f78b6412ed3/rotexebojabosedikivon.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/1g5u3nberoe0hin886r32b0vrn/sukimovugitodi.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf246e90b---70215885942.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae96a22b8cc---rupedafufabof.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b81b1744c9c---37409634283.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/113c5066af29d0d3f8cdd9fa1cc33126/vujurapefedofilut.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/25306340784.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/59159939517.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8b381852b---rimuxulizofizu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCD 5172 bytes
SHA-256: a38076aa6295a96966d732d25da0c28662fc295d802fe19a8021f6328eccfcc3
font_01_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 13120 bytes
SHA-256: 3eec126f363bc0c63f3ee2547fac56107d6a8c80337bdf44cd8832c51b09f307