Malicious PDF — malware analysis report

Static analysis result for SHA-256 83be0d1e1bd13bc6…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 09:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 496434ad97ff62e280edbcb13fcbd5de SHA-1: d2ba42b6ca0ecafa7d11ea2bb5a6e262abb0f433 SHA-256: 83be0d1e1bd13bc61b5f31dfe9b4d8f936b6d32220a2dc5077772b6054df129d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm pointing to potentially compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the presence of numerous external URIs suggests an attempt to redirect the user to a malicious site, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://wastran.ru/uplcv?utm_term=american+truck+simulator+2+android PDF link annotation
    • http://beveragesgs.com/userfiles/file/vuwudoxorunaxeke.pdfIn PDF document text
    • http://pb-book.com/user_file/file/62919418862.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/35514758657.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140f25045bd5---96316452390.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/navowizuxoz.pdfIn PDF document text
    • http://homeopathyhk.com/files/fikiguvubigitexewopi.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/vurifilol.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/9122537650.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/61233304221.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/69128142717.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/titipex.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc3d589a5---govazipiwafaxuze.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133481eae5ad---xurakatusavusezapo.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b5a590d614893cbd9a1655df6a9cf98a/21013000497.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091808570820888.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/kebiwejum.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/30678172328.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/68300989623.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cc6eb3b5c---58842260267.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/28967746325.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae9fa4331---76617779681.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/fibumisop.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tushue4kcc6f81urdcive5mbo2/nifagimejebolut.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/84947612011.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/80923723135.pdfIn PDF document text
    • http://saimiri.name/upload/file/91050544151.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD278 10824 bytes
SHA-256: e1f222020c2bc2ddaea658a8e96babd9bacfc632f4bb3242b19d8388616a1c20
font_01_sfnt_off0000eb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 23288 bytes
SHA-256: fd3e3cbdb63ea01317c544e75bce3b61b4e2ac59c954d5c04658d87d8d98983e

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