Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a884cdc8df018e…

MALICIOUS

PDF

72.9 KB Created: 2021-10-01 04:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a676e842358b368088cb1e894142542a SHA-1: 13adef92bd9cc629b3f1bc339c9cc7a928816d90 SHA-256: e5a884cdc8df018e6fce0d734525b143c151720720c35e83646ede82b4325357
184 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of URLs, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://zkmeiqi.com/admin/ckfinder/upfile/files/vamekabosoxilop.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ce73e46e5---foleka.pdfIn PDF document text
    • http://cx-gl.hu/images/files/zetanuj.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/jexegej.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/1379591828.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/bijolumobeduxolopolop.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/fopobifesovobumojedutijug.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/sunugemi.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/mutezoje.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/tomadejaser.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16149a232c701b---vajutu.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c32b675096---69902226605.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/78208778864.pdfIn PDF document text
    • http://cftckr.marketsearching.com/upload/files/riduwaluvo.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141c2c37b07d---57501170661.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16150f5cd438b2---sumarurum.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/fazepinajakup.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/retulug.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/6116289835.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/xibitelixetovozos.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/munojurumelexesumu.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/jatanatifefijijuxok.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/lejorofonaz.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/29/35430068698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=animated+clock+wallpaper+for+desktop+free+downloadPDF 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_off0000b611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 10940 bytes
SHA-256: 235e82c471033bb616e7a0c03f234636d31ff9fd20a8dd7afca302679c3b377d
font_02_sfnt_off0000e790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 17172 bytes
SHA-256: b0d4ee50f54a21416d850c503cd3e0c1dd49cd262433e7421698b63dac7b1613

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