Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04cec3b0f4da6de…

MALICIOUS

PDF

94.0 KB Created: 2021-07-07 03:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82230f567a99a114065f561b48782a92 SHA-1: a862098c932f39d3c53bad19641fdc80486238fd SHA-256: b04cec3b0f4da6de4971be77b065d7ae11b52e3db79751821c2aeb700a7d85df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ecbe6c009fca97bea895389b2a912646/65853887704.pdf
    • http://garageanything.com/js/upload/files/73845972596.pdf
    • http://architettipassarinmarzotto.com/userfiles/files/22453813033.pdf
    • http://studioaba.net/userfiles/files/56097068946.pdf
    • https://vietrocknet.org/app/webroot/img/files/68174663933.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f815564ddd---56058543921.pdf
    • http://ofipapel.org//ckfinder/userfiles/files/pekekifebukebiwa.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/2aa9007c08e1912f898ac82f930c230f/35123021445.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160834b85be52e---pomolegogemipegabuxu.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/63f62b983a34c2cfe1e8b5777844583f/zobutosizejamupukanuvotul.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/63cda0e56a38ad4789b51b4bba5c5a73/41991002041.pdf
    • http://ruishikaishi.com/upload/content/files/2021/06/20210618091925.pdf
    • http://marta-galan.com/files/varios/file/3809869345.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/19c742beaba8020d671e2a66abb902f5/49399176732.pdf
    • http://goddesshair.net/upload/users/files/fejipujoravovogozawoziwa.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/a22da35fac3c8adfad603d05cbfc5c29/43299610953.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d667265ee21---57860365661.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/raabu904b0csoi38fo8pkoqfs7/mukizukurifa.pdf
    • http://aylincinarli.com/fckfiles/file/xovovejokeridufomonu.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/bff6a1e89618bca56d727c781837697d/womanojulenulogemuzub.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/t3srgt6cj6qnt4e55750nq58nd/41557416618.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=jannes+in+the+bible
    • 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_off000111af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 16792 bytes
font_01_sfnt_off000129c6.bin
b83e7ca4a44217870ed1935341897c76b800f014c9be926b2c6da30ecc8ff810
pdf-font-stream PDF embedded font (sfnt) at offset 0x129C6 10116 bytes
font_02_sfnt_off00014042.bin
80cfb4a4374a001b8ee08e3f6f1d12dc7df2ded2213bed66ed526eec3e30cdc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14042 16692 bytes