Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d7d57c94e2ead5…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 07:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3085124d8d207b2eee96ae70f13d0d2c SHA-1: 65815fa3273a43c6262276531c1c7667d4a1d4f7 SHA-256: 72d7d57c94e2ead5ef46580fbfd0d4d2443bb86d23c32ca6ce94b47c04b51985
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to malicious content or downloads. The file's structure and link farm nature align with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=manual+fragstats+espa%C3%B1ol
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/3403055a7592fc066dc627a306f95d25/xolinelisuligetemojag.pdf
    • https://sibois.eu/userfiles/file/69719830672.pdf
    • http://gokea.org/upload/editor/files/sikagogozifajed.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14695fb17---zimokuxusojalekolex.pdf
    • http://nedirajtebosnu.net/userfiles/file/wegovuvupagokilel.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/6c50c724e516b2b4f81b99b0a1753104/43876337640.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d524307a8eb---13467718501.pdf
    • http://ahcxdq.com/uploads/file/210554573521.pdf
    • http://eltonltd.ru/sites/default/files/uploads/disuf.pdf
    • http://pereplanirovkaoblast.ru/pict/file/tikuwutipawekegabululuji.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079356341a1e---xofufunesuluzaroz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67db02fe25---zenevabagalevev.pdf
    • http://artecgroupservices.com/imagenes/file/perefazemipojus.pdf
    • http://solarissoft.com/img/userfiles/files/11216546251.pdf
    • http://www.cerel.eu/images/wyswig_images/file/wusexemuxobabujuv.pdf
    • https://pioneerlift.com/upfiles/editor/files/zusov.pdf
    • https://www.idd.no/ckfinder/userfiles/files/memufon.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612770f431b05---66488609260.pdf
    • http://cn-polylysine.com/d/files/xoluzeber.pdf
    • http://graficaeformazione.it/userfiles/file/99739445233.pdf
    • http://stolizstekla.ru/userfiles/file/wedovezupotoz.pdf
    • http://chinahongji.com/d/files/jufogelapunugosoxaxefuxoj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DF 16792 bytes
font_01_sfnt_off0000ecf1.bin
b5ca321c35571ed77c785a5c9998d1442255a9b69718c4ff9cfef9de608cc4a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 17692 bytes
font_02_sfnt_off00011afc.bin
1b4b74db0a05ece0379860840e656ef48fbc0559acd9207e579a3bc3f2391edf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFC 10740 bytes

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