Malicious PDF — malware analysis report

Static analysis result for SHA-256 052281ffb758453c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 14:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3093ae49031acfa1a721e8e626992f5c SHA-1: d735b24ccc87791b9e313f62d82f2c3f1fc9e30c SHA-256: 052281ffb758453c052229af5296837a6a97b2bae234e5f66a2d26ec3edbe302
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=paint+tool+sai+pdf PDF link annotation
    • https://eqonetech.com/upload/userfiles/files/11679383452.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161404bcf662b0---60734274159.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cddebbc78c---204640734.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/xuxumaxegowirafu.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/29283535355.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109041842266732.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/42930547171.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/60662711911.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/17230019953.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/lijogul.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/fivej.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/delakimabubozafulob.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/37113562483.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145bad802340---lozijevizojow.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/48123732254.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/62210006164.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/50759931031.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/51509856390.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/jezosozuxetizaw.pdfIn PDF document text
    • http://change4best.ru/upload/file/gapidowarubalos.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3a2d8eea8---miwugutuler.pdfIn PDF document text
    • https://mollis.rs/files/70094265316.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161315067e70dc---88478197183.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_off0000df4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 10260 bytes
SHA-256: c1fe00ad7a4cb05c296a51ea2dc2983b978c5245eb335fcde55125ee29feba0e
font_02_sfnt_off00010e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E89 18200 bytes
SHA-256: 13a5a72f80d3d44076585dc871d21b3b57fa34d494bd97f4740d1821f93066ef

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