Malicious PDF — malware analysis report

Static analysis result for SHA-256 7962f0320e63f135…

MALICIOUS

PDF

75.7 KB Created: 2021-08-09 06:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f2d6480f51585cb89d7c5eb761ab8dc7 SHA-1: 8574424d887a8430ac042d8aa8a26a98bbda1a66 SHA-256: 7962f0320e63f1353468c6f00ebee266ed2b524b56e4203be88ad475787904c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a malicious link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=nicet+level+1+fire+alarm+practice+test+free PDF link annotation
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/cdf04d4031313d610e9b21f25a99d90f/20648290801.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/31128577078.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/92643474625.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/joresokedorujefunun.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/tonupatilawajiwezus.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021061903331480554.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/voliselojujofepow.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a5531a31686---30059096500.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/dadonoxemefawutomaropo.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/14071429658.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/siduw.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1632dbfea1---vopabe.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/71759022468.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/kodazemoxodebafige.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914e453273c---86581192775.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/im7l7vnskc50c7knn3bgq9b8f7/57158539598.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/gudujijafifedud.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/21413088267.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d42018218---bemowosorefarunebadil.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/71eee75a1b6456127e238bd9041ef499/xufuzenokafipenedelixuxo.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/jowowo.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/74585193525.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/86269301741.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vemolerovoxawiwebug.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_off0000c6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B5 10512 bytes
SHA-256: 78dc357a4d88f4db9e810b702add842951bb7fdc13ded05dc0427f2791d6b0f3
font_01_sfnt_off0000deb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 16324 bytes
SHA-256: c8d4911352f8c666331fb073831adfce4bf7a0209a55972e6c3d88118b11764d
font_02_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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