Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba0a1314b90979a…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 00:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9eb9aebabd543fa1ec92d60bb673249b SHA-1: 495f6859690f2f0e6da47c9a1d1f27dca3d1d219 SHA-256: 4ba0a1314b90979a44eab1daf91b9d94425930202736d01171159f95d97ed85d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://visionbrindes.com/admin/fckeditor/userfiles/file/zevarajuteboj.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/kmbu758qoi5p7h8megjkcflgad/60418792052.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/68450592129.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ikjmr5u32e391b8461l52hd2dq/11011734206.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827aac7b3a2---bumadevofawumoginapokig.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/f731o9mdkur8uq5m2fh6lva2p3/mexegigijalevufiwis.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/basejazexowolizidifamuf.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/73188274283.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc09d8bc06---madopikixivipijil.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/35799245410.pdfIn PDF document text
    • http://beiks.info/public/file/giwavedamekabaxe.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210627174623_w3f4rj.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e9c536d17---xeveradunukemelekafitu.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e7cae4894---nibanovowugituv.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/76182982666.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607886ba4ac31---wurolugejatogo.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/pexizifepobas.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/1b82e4444045afba855bf106fbaa1704/vibawexibokeb.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/89e0b77236026d7b15c14a5c82a3f671/12257405458.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aecd1722c3e---tumivef.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc252c58c9---kezofipetil.pdfIn PDF document text
    • https://aashianarealty.com/file/95916163313.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/basuwov.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/zopawibi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160927a50a3065---xexax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=imagery+in+hope+is+the+thing+with+feathersPDF 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_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 10912 bytes
SHA-256: 859b80257f041772d4aef62fb5574c69a20212ffda0eb41b356c3dd25ad0c3b7
font_01_sfnt_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 17292 bytes
SHA-256: c48a0b5c1db61590ba28e53af307658a5efbbd509df1ef27cd1ccaa754c3d0c4
font_02_sfnt_off000131ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1