Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13c7348f4064907…

MALICIOUS

PDF

91.5 KB Created: 2021-07-29 21:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 830c3e015aef324297c1a852758c1691 SHA-1: 7d4cf4fc21c4bee86b950bb17526de5a131b5867 SHA-256: b13c7348f4064907d27cbeee432f7ec141124b96d773aa2d5f4de9f4304a501b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. The primary intent seems to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cortemadera.com/wysiwygfiles/file/xubuz.pdf In PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c5b2747617eeb2f6008d49f93a940de0/xogesaboziladuvomuziv.pdfIn PDF document text
    • http://shamayachts.com/upload/file/pavet.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/54782645634.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/jusavuj.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/8140945735.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a22ee4724c---57995905197.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/8745282588.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/8q229sjd3ul19s46f1jgbj4suj/18054402157.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/17970994859.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160913210cb485---bolifimuxekugojo.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/zisoxumelaxumufodefe.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/fve9v084f02roalvj5af6o7de5/46689173833.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/n57hseggfhqklqrh18l58buqk3/23268030095.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e60ae879d8---55015209397.pdfIn PDF document text
    • http://aplus.to/userfiles/file/48295871271.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/27396779514.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/7fe8b82b4155b1c012f957a90df28e91/zonufetel.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf52d8344---nixagikafotesowodulegib.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608099938e5e0---kabosapigojulo.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/vemasedobigufasuzonijani.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/93088769267.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160756ce6db233---87337267945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=geometry+dash+meltdown+full+version+mod+apkPDF 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_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 11260 bytes
SHA-256: d8cf912f42f4feda05279bb7253ddd86b0584b311a1738ddd90619dd07172975
font_01_sfnt_off00011123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11123 21028 bytes
SHA-256: 53e8ec9e78ec3ca3abe037684c7ab949052625448fadc8fc382b060710f2494b
font_02_sfnt_off000146c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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