Malicious PDF — malware analysis report

Static analysis result for SHA-256 580928d0d74dc087…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 16:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b94dfbe27e4638efc9d57b703876fbca SHA-1: a103ac212a1d4988a56729729fb2b44acc225a90 SHA-256: 580928d0d74dc087a63ad5c087284696a6ee6d4da92253b0ac1739177e83ddc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://dga.gr/ILC/img/file/budegoriv.pdf In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/p1eh538midi38sv1mo9909q6id/wezurozogikurive.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/bfaf27451725926cd1923a4183c6dec8/57277526022.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b42c47eaf---mavodelurinatulodib.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/valetudoxemajev.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/mukopemusigib.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/42871309801.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/pepita.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/vasunomugadomatuxonaniwof.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/96653087022.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8747aca1f---98512456201.pdfIn PDF document text
    • http://zl369.net/userfiles/file/61973658569.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/resenazudetipimafun.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/20665698351.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/jafisuwezapimevibez.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/45408284463.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/lopivi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613819d63606b---watekezufilopefediwukuf.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/49967238596.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/55032357170.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/pedigojemewomuxegumunox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+android+phone+for+xcloudPDF 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_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 17620 bytes
SHA-256: 835b35400be23056694d9067a027d90a139c73e4add2fd3f70677050eed59970
font_01_sfnt_off0001126d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126D 10972 bytes
SHA-256: e841bf9984baba13cd67e9dd2e7fe60c561e348f9f5ec933199f4fcb454c7e91
font_02_sfnt_off00012bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1