Malicious PDF — malware analysis report

Static analysis result for SHA-256 54960dbbac49cb64…

MALICIOUS

PDF

85.4 KB Created: 2021-09-23 09:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17ed9c5b45290aff4665983ccf05f6b5 SHA-1: 0408708c101b234f75347f42ef53c3c5c68d61b2 SHA-256: 54960dbbac49cb64c6bfb900e36e10eebceb0bed673058f6cc25006941219db5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links to external resources, some of which point to compromised WordPress sites. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste commands into a shell. This, combined with the ML classifier's high confidence and ClamAV detection, strongly indicates a malicious intent to execute arbitrary code. The presence of embedded JS and the lure technique point towards an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/90228997279.pdf In PDF document text
    • http://7sate.com/filespath/files/20210915195224.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/85464189804.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/19976986026.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090705012273499.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/30580548533.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/88728712611.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/rafek.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/52494845457.pdfIn PDF document text
    • https://apra.pl/files/file/8765025266.pdfIn PDF document text
    • http://kesifveotesi.com/files/50000607659.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8ih5mke6kv9a9le6nqfn02mcf4/kajav.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/vavufulasev.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/jawotinabopage.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42716236968.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/82235288111.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/84589700164.pdfIn PDF document text
    • https://vitanov.rs/files/56485769549.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/voxudasivino.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/sinopexege.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161471a7fc4876---34694301572.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/busemakokewefi.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/11841456667.pdfIn PDF document text
    • https://bloc-immo.com/images/53423240879.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/34896320605.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a0b986598---wiperodizozujuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=apk+to+jar+converterPDF 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_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 19292 bytes
SHA-256: 35e51e8097e18db77d0f61c030fdaeb024a74b94dfc36845d68f43e88a61defd
font_01_sfnt_off000118ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E1 10332 bytes
SHA-256: 2301fec58d81e55cad5ef9c50996bd470bc010ee733c4c75548e3fe110dd2da5

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