Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d812118cef0010…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 08:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 014c3b6c6e726c0c22c29901e906d484 SHA-1: 07afcd9550dc2565a27a01749c1bc794a337fadf SHA-256: 28d812118cef00109c1828ec1feb19c57b7f9bb6bb094c5d600dd1c37a93368f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The document's structure and the presence of JavaScript suggest an attempt to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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://medvor.ru/uplcv?utm_term=android+application+development+mcq+pdf PDF link annotation
    • https://sapporopools.com/contents/files/lepalolitasu.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/28648899577.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/97823678737.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/56862041289.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/75426083828.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/99473462921.pdfIn PDF document text
    • http://regcureguide.com/files/files/temun.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/wilopekizumoki.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/vulikiraz.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/29115071190.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/1b548db18a7f5500a4b6ef9cfbdbdcc5/12358945170.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/runebosewusomadimi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1feb2f8fd991a7e6ba7987cae64a96e1/78621409497.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/repizuroganemewolowu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141ff696f2f9---fesexonake.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/81478310291.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/4f21f62f22a6c476929f3ddd4c5888b5/54163660504.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/12890563772.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613726904adbc---72838538960.pdfIn PDF document text
    • https://noventa.cz/media/files/file/12981950911.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/jafinusupedi.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_off0000d3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C8 10808 bytes
SHA-256: 77847d17cf42a2fad06c841b29564e521607a6ad41f1595b4c60a0fade5e7e5b
font_01_sfnt_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 16884 bytes
SHA-256: da352538f3cd3d6e938de6502199026c5c3ae35ceb7501e7485b30dcf8ee27d4

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