Malicious PDF — malware analysis report

Static analysis result for SHA-256 0381c4f2060eea4a…

MALICIOUS

PDF

72.9 KB Created: 2021-10-07 08:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: db672d038f329c330f0eeab435d975aa SHA-1: 4e4f9a55d03c06dd795f3ae53733db4265c2899a SHA-256: 0381c4f2060eea4a77f6186cfb4cb5277ea180c249a17072d58c993debeeae99
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many of which point to other PDF files hosted on potentially compromised or disposable domains. This suggests a link farm or SEO poisoning attack, likely intended to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://manenshop.com/upload/files/nujolododuwepu.pdf In PDF document text
    • http://rabotatver.ru/userfiles/admin/rowipovupowoxuxapitaxak.pdfIn PDF document text
    • http://jcsh.bluezp.com/ckfinder/userfiles/files/5167085296.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/konabu.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/13155006232.pdfIn PDF document text
    • http://healthywithhart.com/res/file/84756998798.pdfIn PDF document text
    • http://nova-auto.com/upload/fisubazoxafijonunonegaj.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/36643634393.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0dafd205c---77815354753.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/namifosidetejenozakobatir.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/92540389862.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/nozuwirilowu.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/vutulixesesikazupugo.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/63289280390.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/rodixupi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd20c342d0---likugirutasifosikaf.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/91255021655.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/60344523369.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/s67bcn80mkqgh3klukcnrc8dkl/44540082731.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/wefaredejubikoti.pdfIn PDF document text
    • http://7sate.com/filespath/files/20211006145034.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/kagilitibop.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/15550800765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=html+and+typescriptPDF 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_off0000b980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD192 17052 bytes
SHA-256: d60e7d82f35e74c4e1ba6dad539268c702f66178652cc9eed7892b802f6e215e
font_02_sfnt_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 10660 bytes
SHA-256: a7036fa1a6ca142734fe102b2280d01246bd8e11584b799350ce55fc9c8f6ffa