Malicious PDF — malware analysis report

Static analysis result for SHA-256 b820b4975deaf13a…

MALICIOUS

PDF

95.4 KB Created: 2021-09-02 12:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40aeb784306298d661f301869602c091 SHA-1: 3616e0067612b21f543f96e492145c66ac39c60d SHA-256: b820b4975deaf13aa42ec6b0b0b5a466a650f38e9e3a1a3a10179b2097880286
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tsradviseurs.nl/mailing/images/photo/file/73739270431.pdf In PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f98ce4cdda5---jusulu.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/misenipo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec6a4078cf---wokanimepezenamasilu.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/91400408867.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/2q922kr7144ig0qi68oe66284p/74564525594.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081739e2f302---woxinedunugijomujunufuzif.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/16760004411.pdfIn PDF document text
    • http://kleiberit.ru/files/file/98792737542.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/48165804346.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a529708842c---najevodivoroxewof.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/fasixeko.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/dsjv0tg02dreir4u8d8t97rg7v/gogitotuwovodipibugiw.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/78868311742.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/mopowapejuwoj.pdfIn PDF document text
    • http://zxsolar.com/d/files/rudis.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084f0ba7a424---xopabijafujuvadutiwarat.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/zijapewubilir.pdfIn PDF document text
    • https://guijek.com/userfiles/file/96401557920.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b981f71a779---82635207258.pdfIn PDF document text
    • http://domosplast.hu/files/file/toxodusapoz.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129483381502---15928666400.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/kugowukedewafonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=microsoft+access+2010+sql+tutorial+pdfPDF 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_off00010e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 11044 bytes
SHA-256: b0aa36f7a5ed939cd6597af419aa9c6cdf0d7b9b572a0ba6c0de7e59c5d87513
font_01_sfnt_off00012810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12810 18312 bytes
SHA-256: 2f7e49361a5ffbec7e191249683a19600749d610ad5928de58871632fa1e083b
font_02_sfnt_off000157da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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