Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db508ea4e440571…

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 21:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c51543099e1bdfb0b27a8feff514e75a SHA-1: 7e51a6b78b3d5073ab55a437fbf387823d041b41 SHA-256: 9db508ea4e44057198f49236d5118a1dbe2a623af76537b8381db1f9cd542bca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Several heuristics indicate the presence of link farms and compromised hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210905103829.pdf In PDF document text
    • http://shqinze.net/admin/upimg/file///51726674432.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/radizenaxinup.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/3290313001.pdfIn PDF document text
    • http://ibb-online.ru/f/file/wipopofil.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/venezomok.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/bawam.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/46918823812.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/66659009451.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/97075601756.pdfIn PDF document text
    • http://plise.org/userfiles/file/26670048861.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/34557278142.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/58271065293.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/51381471445.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/49d1c4b1dabff32a337e822c69b80f0d/legavumufexenenesos.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/12691967309.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/67845244431.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced80ceb97---rexezumifafipukevijafus.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/59981600230.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/xorirotola.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/dedusupekalevisidug.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/96831846042.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/misage.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/15672568665.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qkgbcpusrijbjhmfho32o2v8h6/97690448844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=find+friends+app+for+androidPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/84080421627.pdfIn PDF document text
    • 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_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 10324 bytes
SHA-256: 890c51e69b0bbc34d6ab0bf216061034b6b9a75e752d875bf1c2c6305120c1e9
font_01_sfnt_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 17312 bytes
SHA-256: 572e89438153eed899baedc3c52e73a426231d935f0a2a37911e764d8de6aa26
font_02_sfnt_off0001312e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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