Malicious PDF — malware analysis report

Static analysis result for SHA-256 307a04f0576d1ba3…

MALICIOUS

PDF

81.9 KB Created: 2021-08-23 13:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 297f056a46eace8f93162d307338198f SHA-1: 08c7a919ea3dac79b0ae2ecaaacab70ebcad7bfc SHA-256: 307a04f0576d1ba31ae59bf8ac03a5af7ad075fe69fd995014fda7a991c134ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://krisoc.ru/uplcv?utm_term=account+words+dictionary+pdf PDF link annotation
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f9f5afc4b---bigagitukidosodolinawud.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b470bf316eb---kibetizi.pdfIn PDF document text
    • http://ipublicity.cz/data/file/jusen.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/d72c6a04aa7b82cdd42d1a7de6e0a0b4/mogerijiraperu.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210821035946286.pdfIn PDF document text
    • http://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/ginid.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8f651037c---67612135273.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e70cc6a2879---kufukabinubewoxaxakabu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160793378cb1c1---xudiwul.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/lazejasupufamigizoval.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/05bb49fcc7357a12667cccc9abf3bc1b/83852353806.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/vozemesujukuwilodejataz.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/87ed9adb8f20d714d9e766f424ad61d6/dageza.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/cc642506b8b27f1eef789090f9232322/zerupotewodofulexajoge.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/51971684125.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/raxuguvinogimi.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/92832324525.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b3cf4a12f---34594269466.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f871c576e9a253068142e35643d4fd50/mivijosebuwakodasezagu.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/29869834790.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/dovotofagojadapu.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/0918ff2f69338939c392e20622da66e6/ximeviruninefaz.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607184d7809ad---31536957432.pdfIn PDF document text
    • https://ferropula.hr/files/xizov.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_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 16604 bytes
SHA-256: ee0bb3cc6ce9ba8a2bd66853bafbd0f05eab1fa4d2e8767377ce46559d809b03
font_02_sfnt_off0001204d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204D 10716 bytes
SHA-256: fddbbb1d9aeefa02efbd077468242faa89cef0a8863c1ddc3ed6bd483a5e27ba

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