Malicious PDF — malware analysis report

Static analysis result for SHA-256 7164642fde0596c1…

MALICIOUS

PDF

72.1 KB Created: 2021-09-19 22:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ce4472bb3096916f6149b6b0a2ddb6fb SHA-1: f7ed0e81429d4d8d39673536db00864f74ba42de SHA-256: 7164642fde0596c18911992787f68046036199feb8870fb476a7b383f68e2b0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The embedded URLs, such as 'https://drafthe.ru/uplcv?utm_term=1+trillion+minutes', likely lead to malicious content or phishing pages. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=1+trillion+minutes PDF link annotation
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec033e7bc5---14183401285.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/39458286841.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/fb32ff9086b496c3d3ed8e5f27505921/komobebomibufax.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/72654834773.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/guxotebewixojorifof.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff07112bee---muwawizumeneruno.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/43005874584.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/xamumowamufepij.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/1724797868.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/9ee8e499002f6de2706868512f3dbf2b/fogulogadanalibir.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/ludobariwoware.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/75533228080.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/bemuripumawiwudapiraju.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463c6345882---xebegafojifirumipizogafov.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/75351107844.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/mikipikus.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/dokax.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/zavobadabujot.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f7de16e0458ff804bf252c7485bccb04/74852602800.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/xaluxuno.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/14761592534.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/faxusogededuwes.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_off0000bbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAE 16024 bytes
SHA-256: ad4fb02032049ab69e09fe71804366b069c36deb60efbdd0bef79cb19ab08a07
font_01_sfnt_off0000e450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 10160 bytes
SHA-256: 24f5edfdc617acf2ac4480de0a1cec602cf0fc7ad181b9f443488dd298efca51

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