Malicious PDF — malware analysis report

Static analysis result for SHA-256 37db080e06e8eb8a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-23 09:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ed64b5a5dd97474e96df4bab4bacb38 SHA-1: 5fa17dbb4da0d6b50be9a0010f2c23c2a1e358ee SHA-256: 37db080e06e8eb8a665ee7cda0770b73544ad042c8bb6e0dd5faac572ab5dd17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff48477042---2497478388.pdf
    • http://solmoda.it/userfiles/files/19646900897.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d78ae66fe---jutuxamenub.pdf
    • http://guidesdugrandlarge.fr/images/import/file/bitego.pdf
    • http://classtool.info/upload/files/25199237262.pdf
    • http://khyljg.com/uploadfiles/files/51315750244.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/98125652012.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/lazukuvujuwivijof.pdf
    • http://hanmih.com/userfiles/file/20210907222547.pdf
    • http://frigotechreina.com/userfiles/files/62166465563.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a87c4db721cd7612c88b0f823a6e5d60/41320922797.pdf
    • http://jpind.pl/userfiles/file/munusakekavinevesedizopu.pdf
    • http://cedule-plachty.cz/files/file/kofolajo.pdf
    • http://getsolarnj.com/userfiles/file/50425209226.pdf
    • http://youngthisyear.com/ckfinder/userfiles/files/vadamasuligosudig.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b3b564181c231abe3c01f400a9cebf7b/36158356898.pdf
    • http://taiwangallant.com/uploads/files/202109031912277843.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/a1cd0a6066c5a9f9a734bcd51f051518/lovamipineni.pdf
    • http://rklatex.com/userfiles/file/zuniroj.pdf
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/76095808801.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+on+ios+cydia
    • 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_off0000c95a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC95A 16792 bytes
font_01_sfnt_off0000e171.bin
2a21bb40b5f22e18f66201b1fd4650c0f1aab0d17caef9375812ed3be0f01013		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 10184 bytes
font_02_sfnt_off0000f85a.bin
6e305584b07849de99a2f2ae753c06f5741c03e463d5918991543dacfbe7c77b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 17008 bytes

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