Malicious PDF — malware analysis report

Static analysis result for SHA-256 298a1cea8ffd7cb2…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 17:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d21f901b9929f7afb647bfdefc45238e SHA-1: d20d77fe23090121038f270ef86dbc258b38454c SHA-256: 298a1cea8ffd7cb285a94a7494afec88305991497d4f92f164aed1b8839cc187
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085283ce8cf6---fuzij.pdf In PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/tugibusogukerivobebaz.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/52881166274.pdfIn PDF document text
    • http://domplus.su/userfiles/files/18370004681.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/nagot.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/juosggmia70r5mbuhhq2m3u8fp/mepudovusozezudamabalix.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/78bedf283e2ff03d0755a63e68d363ac/54997795126.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/gesome.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b59b3d8fd5---tajejerati.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/gigomupebubij.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/735370565.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/pimbdav494779kjkr5h87t3c74/70937642903.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/selatobosamageja.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03e44a18bb---kenusujodetawoberodupiba.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612596d04576d---3931040760.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/wugenabawer.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/fegurubep.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/nezux.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/74381226263.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090fee17b9ef---24903913183.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/xuwobufoxefem.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/22095698058.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/kuzalojed.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/16803583778.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/gawazadugifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ielts+band+9+model+essays+pdfPDF 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_off0000e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 10840 bytes
SHA-256: ef3087ff40cb81e2343b3d5c62d3198c48f44eea3cc699f2655ac268e43f160c
font_01_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 20420 bytes
SHA-256: 6eb6dff43a20538e8819f3a5e31cc019cb80ddf7cd1e242412858a5ca2d8ab48

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