Malicious PDF — malware analysis report

Static analysis result for SHA-256 74eab63ea34095fc…

MALICIOUS

PDF

77.5 KB Created: 2021-09-25 23:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 164f8509fa45f21d961bee9e2e29e7d1 SHA-1: 516bd4b9b725c4e84904acf31cf568d59689822c SHA-256: 74eab63ea34095fcc21a8956d289d64fc6864de91aac9da06e3eb3b0daed6c85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript further supports malicious intent, likely to execute further malicious actions or redirect the user. The ClamAV detection and ML classifier strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://chcial.ru/uplcv?utm_term=soulsilver+victory+road+walkthrough
    • http://kebirbeton.com/userfiles/file/wumidexaru.pdf
    • https://egokituz.eus/files/galeria/files/zigabukaxarovaposeko.pdf
    • http://orthopediedelft.eu/files/23624502249.pdf
    • https://e-motorcycle.tw/upload/emotorcycle/files/xiravesuxexuwazupax.pdf
    • https://jamuiboe.com/webroot/upload_media/58678659584.pdf
    • http://bjhtdszdh.com/v15/Upload/file/202196912178004.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300d35d9c88---kaxirobazimezirom.pdf
    • https://bushregenerators.info/userfiles/files/koxiwobubup.pdf
    • http://safedoorsystems.com/cmsimages/file/9971375368.pdf
    • https://gadesign52.com/uploads/files/202109050856157580.pdf
    • https://joinvita.com/neu/userfiles/file/gofurilegilesozaforasofuz.pdf
    • https://pbchistoryonline.org/uploads/file/51870360018.pdf
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/fatinubezedirol.pdf
    • http://aviapartner.biz/js/ckfinder/userfiles/files/nidogoziwosepiwotoso.pdf
    • https://thuaphatlaihanoi.net/uploads/files/67891087053.pdf
    • https://lotteppta.net/beta/assets/file/24823778376.pdf
    • https://31app.com/userfiles/file/xagometi.pdf
    • http://lamorenj.com/userfiles/file/kurire.pdf
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/62456888188.pdf
    • https://genegurumiraclehealer.com/userfiles/file/4107352944.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b784cb9df---naliwuwisimenemim.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b60def4bd---7702896304.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148f5da74279---jajuzimenetesudokawokas.pdf
    • http://daindnc.com/fckeditor/userfiles/file/figonivijupadetitiwarape.pdf
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lujivufolebopegomarezu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c208.bin
17353e71078fa34a36e25ee852026cc0a4384ff36ff9284692e4f70e20345bc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC208 19948 bytes
font_01_sfnt_off0000f661.bin
0c54fbe53bc0f9971a58b3bb86d03f5358513656fd0efe0b3737301e5d327e35
pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 11080 bytes
font_02_sfnt_off0001103d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1103D 16792 bytes