Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a4ed421d63be51…

MALICIOUS

PDF

73.4 KB Created: 2021-09-14 04:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0bd1b3c52dc697bcd8b753ef045d036d SHA-1: 83d8e1dfa9d01d001e82e0049453e4a56661bd16 SHA-256: 19a4ed421d63be51c7cd24fbe4450f4481052e619238bfab41e6d3e2eb00aa95
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting, characteristic of a link farm. The presence of embedded JavaScript suggests an attempt to execute code, likely for further exploitation or redirection. The overall structure and URL distribution indicate a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ardennes.proximeo.com/ckfinder/userfiles/files/rugotixizonunodemitobopo.pdf In PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16133dfb09b223---wasibizoxox.pdfIn PDF document text
    • http://hejia-ele.net/upload/wufuvozuviludiwamas.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/24668698638.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/346f7bb9e913b1f330aced21c3a50f67/33716823449.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/gotakirowibowopibenonaz.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/57736929883.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xaterebekuvubadigad.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210903072609.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/raramusofifupuzi.pdfIn PDF document text
    • http://stroi-sistema.ru/img/43408375957.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/95961646924.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/51185373398.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/36461099248.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210913194918.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/75708068019.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/bijikegijakikoxixovo.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/zikaxosujesupabow.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/sidovikawevinisabewenew.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/17039325490.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/vinefarofa.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/vegoxedetejubururipanezil.pdfIn PDF document text
    • http://normel.org/files/upload/file/23267439151.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/baxifiv.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5a6518893b31ed133c5e2f3a37982dcb/99538709278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dulux+snap+shotPDF 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_off0000bf72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF72 16660 bytes
SHA-256: 172cec1fa16005118425bb95cad702a4194b3f6ee1ef6a5e0b0ff9844367e560
font_01_sfnt_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 10228 bytes
SHA-256: 7cde4ef3b1f30420c614ba9f15a8aafbd966899673b9587bc2189edac6a7c93e

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