Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5146d7205ff9aa3…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 20:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ecb798c247bf94d086450ade79ec7a65 SHA-1: 1d51298afe780288b255d2c297bcbae67bcb8f14 SHA-256: e5146d7205ff9aa35c1c4b39cc8fea549ae8b7ca7d2a9c7487e9e808b582d6eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, some of which appear to be compromised WordPress sites, suggesting an attempt to distribute phishing content or further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=unsigned+int+subtraction PDF link annotation
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/wubasizeguvefotivubo.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/64968429196.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/8170990449.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/naxujezugovefarepavaworid.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/39765573384.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/ganudom.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/palinevowukutemame.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/e9c40306e00c1f68c347ed6651001318/pabetulomovekower.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/10297611453.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/31527305616.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7ef45e32801fca6e784100ef80e9ce99/85188101157.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/46234105690.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074b398650e2---misalakawexilas.pdfIn PDF document text
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/mavaguwagun.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/8277663531.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e95374497ed---16764662847.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///devosi.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caf39dfa71---99685757709.pdfIn PDF document text
    • http://htwy.com/upload/file/31995821075.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/32077589043.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/defiwosu.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/luvibus.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/58234649384.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_off0000c4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B9 17208 bytes
SHA-256: 85a1f5e9d1d04055632472405fe714537ab0820a200a2ed604403d3690bbf6c8
font_01_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 10748 bytes
SHA-256: 54f0a900eeaca8864602c6cbb1f5be5fe887fbc3b1ab4b4188d26217ea6e939e
font_02_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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