Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4c7bbc8310a152…

MALICIOUS

PDF

99.0 KB Created: 2021-07-12 22:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3b693b09eea38cdf7e598c31e8feb666 SHA-1: 68c33fa947e6cdf91d92eea0f9335f20c3820e9c SHA-256: 2f4c7bbc8310a152216fafac4deb0b48f2fbc66b111df155ef843d7cb22bad76
156 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely to lure users to malicious content or phishing pages. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://aucoindeshalles.com/menu/file/detogadujeneletuxoxipu.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a48cb262d0---vimurivirubevijejij.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083c31027174---bunoxubi.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/33200618197.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/movakorawuki.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b12e357330---56610533795.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/44028905618.pdfIn PDF document text
    • http://amandamaitland.com/images/file/17858663050.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9e8e1f735---wupepefiwizezijene.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/25515901860.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c416bee10e4---79259651282.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/91450165792.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbafd3387f8---44866711179.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/67901584594.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/21e2e465852a0210b1ccaefe2a114c1b/22611587409.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/dfb3e69b644bf9ba62a996d758bdaf55/mozetetefivebipug.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba667b137c3---genazixilerarudigimefu.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/29809351084.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/97730271364.pdfIn PDF document text
    • http://www.moyekolodin.com/files/64900511567.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vimogafet.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e53d375e5bb---mavak.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/30190528575.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/14f36d96081a156e687c2d9a6982005b/zunivudakasapugiwuteni.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1167829b2---kikis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=models+of+ihrmPDF 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_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13938 17412 bytes
SHA-256: 1f23208eea4ee9108d979180d72fed80ffed203ed0f82b7ae757cffd5b3e39d3
font_02_sfnt_off0001668a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1668A 10248 bytes
SHA-256: b8422cfc41bce7bfa5e3bc9046707e8b05babb32b8880f853b0566d93746341d

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