Malicious PDF — malware analysis report

Static analysis result for SHA-256 5417ce2199bddf0a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-10 11:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd4e4205d1d503b48c44564b223db662 SHA-1: e8f4871211fed20b34322f6f263c2b687b4f5467 SHA-256: 5417ce2199bddf0afa8d7e2d14678702230ed47954543259e7f773d3010eb45f
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF document contains heuristics indicating it is a link farm and a social engineering lure, specifically a 'ClickFix' attack. The document body, though obfuscated, suggests instructions to copy/paste commands into a terminal, aligning with techniques like T1059.001 (PowerShell) or T1059.003 (Windows Command Shell) to download and execute a payload. Multiple URLs are present, some hosted on compromised WordPress sites, suggesting a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://alyosserspneed.com/userfiles/files/ruwiguwapapev.pdf In PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/ravedetogatogabogurebom.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/kurol.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/10716142546.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/xaposona.pdfIn PDF document text
    • http://4bx.pl/public/file/wisigilorudowomebewin.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/3062229824.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f9e267eeb---77683573212.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/58215166738.pdfIn PDF document text
    • http://gysanya.com/upload/file/210906084456998651dauf06a4yzg2.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/23440669339.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/nawapudawomim.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/zofovavu.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/82921516367.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/kikutan.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/b5519b470255755e4ceea43db4102954/rabogerulimuwumu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4a0c732d---mutakanofurawisel.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/84211262512.pdfIn PDF document text
    • https://asi-filter.pl/files/file/kedizupes.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/28180138546.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/92010825219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=command+prompt+wifi+hackPDF link annotation
    • 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_off0000d2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E5 10748 bytes
SHA-256: a37b002eec23da3fa06f556edccecb3ddeefc70423a77c88d7c4871fc46b1232
font_01_sfnt_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 18172 bytes
SHA-256: 26a5c34245d61a76db9eba8870e5844ab491f2d501a814348cf379a08224e24a
font_02_sfnt_off00011a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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