Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0530752ffe8738…

MALICIOUS

PDF

102.0 KB Created: 2021-08-20 05:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fb2b638127f4203608266ac2ae85d53 SHA-1: 775c4d8e9ed82b08ecc89879870505ab53720c11 SHA-256: 4e0530752ffe8738d9dc59a20b43941b67a5cd94c237ceb5bf22f9f3b552bb4a
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest an attempt to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://accessiblevehicleservices.com/userfiles/file/kitusexegitogukukatop.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c78b8e107e---rovubajojoxugowodelokaxut.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795d4bdd7b5---zawujixezijitu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/lboq764mhvolc7t3rpk01lorl2/62089363780.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/sasujuwilamafavenimoja.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/fewedumelogurof.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16083ca0b58c32---36363548615.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9778637f95---1584869091.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/73543101310.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160906342716b6---26242915465.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/78315274904.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/nuxaloxuwusu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a30ecebe49---jovonagexurixasimategid.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8b809d7cd21ab2ecad9b4c8c13f3950d/vugurapopafav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709e6b03a2b---nigaxipa.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825a480010d---mojapafukonepizejoxigel.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/44134583235.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/41781571174.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c4db559a6fe---12027863946.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/13197915664.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/35375736732.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/kutel.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9812f06869d042f331096453e298dc33/66976480535.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160801909a0a52---dikoli.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/vosagepunukonotolejabomok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=como+descargar+musica+de+spotify+gratis+en+iphonePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001264a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264A 11268 bytes
SHA-256: 71fa7ef44d16a39c42ab99876a36fcd264c1aefa41b89efbaa21665001d7ceb1
font_02_sfnt_off00014061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14061 16428 bytes
SHA-256: 23191a20989a09959b2cbcbcedb805b598ca26499a9d836ac043174a76a4ddba
font_03_sfnt_off000156ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156BA 18832 bytes
SHA-256: 1f455ebf011dafbf8c56311025be23aa172854aa3f59dcf4ed525c8f6b2674cc