Malicious PDF — malware analysis report

Static analysis result for SHA-256 2597532133df51d0…

MALICIOUS

PDF

75.0 KB Created: 2021-09-13 14:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ed21d652a8e0bd49341c706a8ca5fcd SHA-1: eed171cf82b681aeec825762f7dab7f770b4d7bd SHA-256: 2597532133df51d0717ca4e0c5e0c9d080787196b92e1a732a855ad43a39e368
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=miui+12+eu+rom+redmi+note+8+pro PDF link annotation
    • https://vietnaminsight.biz/ckfinder/userfiles/files/vejamalow.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/dad42b0899ac5511592c46d9d65960e1/kigibokulibu.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/66680816557.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/44bc4c22c5dd8aa203e10cfa0fb22580/neripitakit.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/genepa.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26018737781.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/filobopulaxazifekape.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/vipegubukigoj.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/kewiruzuxeduwazefixamoxu.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/xupagajar.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fea329209---ramik.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f4fb385e1aece64e512f07560e8eff91/wavomimagewoxepok.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/maximip.pdfIn PDF document text
    • https://polaria.cz/images/file/4858239353.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/03d8d294908d2fa83f17d6b75c34bd69/17922148643.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-11/2109112249468643071ozxppfmo1oo.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/woxif.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/9243980499.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/1519199723.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c458140afa---58622114298.pdfIn PDF document text
    • http://fteq.ru/files/file/bonijovufiw.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/31108375393.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/49185702106.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_off0000ba22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD234 20956 bytes
SHA-256: 5881113ac52126b3ac5eff1d0cac31c46739922af1c54f795545e8f6c339bfea
font_02_sfnt_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 10652 bytes
SHA-256: 34e1ffe0110baf0bb774d15d05114a0a9ba5f2c64ec3f9b73a6ba204b4e808f2