Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd966e375247fe7…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 21:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 741f14c24c0117956f0a47f17f314d62 SHA-1: 5b323cbd07b56689550ffaa9676b64798c94d2c8 SHA-256: 6cd966e375247fe7f2f32327e0f08c60469c2f5ffb443dc969cb4170806f5f09
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are hosted on disposable domains or compromised CMS uploads. The document body is unreadable, but the presence of numerous external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://vietnam-intraco.com/webroot/img/files/35700434098.pdf In PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/zovalewipiwaduvasesukij.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/54732862965.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e48687e72a---robetunarikogosuxafa.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/27855195132.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/84717980697.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/sorerutuwabomalujoda.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/sapiwob.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35dbce8814---77205906407.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/99363787863.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/972e177fcff6e493acfac58f7353f7bb/64086680207.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/1511150862.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/52357070746.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/gudifupawerotefe.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/24854817918.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/19616f552b2a191b4061d4d99b2298b3/tugigusufes.pdfIn PDF document text
    • http://fitviewer.biz/files/file/wezoguwegozutufepetoke.pdfIn PDF document text
    • http://kleiberit.ru/files/file/gitomalesazavuz.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb746392cb---37993114230.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/16153162723.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/3708648678.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/5806620685.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/nobazidozuzofuzejadiwe.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/woxipuridap.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/zufududopewedipir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=libro+maestros+de+la+costura+2+pdfPDF 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_off0000c859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC859 19072 bytes
SHA-256: 3c4ed8600c9feaa4ef85db554d0b41f484ce56d4de6bf1ea024f6f2139b64305
font_01_sfnt_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 10992 bytes
SHA-256: 49aaed07b09c80d6b2a8b130dc01ea1ca225fd0fa1976efcb481e5c01619d179
font_02_sfnt_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1