Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c6e5abbda1ee0b…

MALICIOUS

PDF

92.6 KB Created: 2021-07-27 17:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b145c29250bec82fbd9b609836f27dd SHA-1: b09c322a67b43b0443624a6344fbdfbb8f16782a SHA-256: 96c6e5abbda1ee0bce2ef22464d128d40f8049f99d7333ba62eafc60452bb5e4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick users into installing malicious browser extensions or updates. While no scripts were extracted, the presence of numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, supports the social engineering aspect of the attack. The document's primary function appears to be a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfd488c97---19208222113.pdf In PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/86888136115.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/18868736540.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/gazalatalawewusakaned.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8094220171320db50b2d191598e6aa59/fulofutapanabomupoxovak.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/lefefapig.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7bf33d4b6b2b5fe3a599e275d75fba7d/jenologuzuvinunivasumav.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/86544127966.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/iia5g32va25qqem97mu7i40uci/9909659508.pdfIn PDF document text
    • https://tomas-music.com/contents//files/sizej.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073d33de9056---60610337805.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ff583eb1351---50397019780.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/pukadawimuba.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/93332359096.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///mowikaduzetof.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f135411b47---pafofaxigegoxusafofulawu.pdfIn PDF document text
    • http://emannsltd.com/userfiles/roguwegesuluv.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/3236831693.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/50118558542.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7gkme05ufpgq3e2mr82e6g99e3/dofosoxuregivitafonuwajok.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/talepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=stanley+garage+door+opener+remote+home+depotPDF 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_off000107a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 16588 bytes
SHA-256: 8ba6a964bf8a04258325f87de6b221d182a696fa4e0a451cc249db04a0985528
font_01_sfnt_off000132d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEF 10768 bytes
SHA-256: bb5027a127869400326bb19145e9c5e3b5559c4f46812954dbd2394c3e677820

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