Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a4f602401772fd…

MALICIOUS

PDF

90.1 KB Created: 2021-06-27 07:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 913e45d1b40f2550e5b63884de411db0 SHA-1: 647b03bae0da9945b2f1932989fc71e041fb4f03 SHA-256: 97a4f602401772fd65802ffbbcbeaa389de5b7b99fdbe10fdac527a381e9242a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm hosted on multiple domains, including compromised CMS upload storage, which is a common technique for distributing phishing lures or malware. The presence of numerous external URIs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/86760979200.pdf In PDF document text
    • http://wingmanresearch.com/userfiles/files/28673273174.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/xuvunivaju.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/7a69b05a3c309529218c640d54b7d6da/76321372121.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074cf85a3421---66672342561.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/0f11dd94d1b3dacd69d9dfce0a31b047/jofukavujefakuket.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/donexatutasunidibarus.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6a5c601ba709272f082aff210001589/gunazubixomobaxoku.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/17395967317.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba1680861---5851898501.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ca30877319dcdc58f0822974a48d1aab/fowodorewajirifegujazevox.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4434e056db---13836894424.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/25adefcc63838d44c4b1461283122098/6869230575.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85b0ba61a3---nitajilelibugirukotopo.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/1258780884.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/naxijirenufosulebapado.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/puxujomon.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/bff8e8b34d2fb434902a6b972d5e3484/zagewebosunufujesigu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607383f31c596---66289882131.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6866e6709---55173357554.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a47173cd---gagusalarozomumat.pdfIn PDF document text
    • http://www.celso.org/download/numizugojisevixo.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/xezadovezapuzegusegopas.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/71af16a92bd1d75026cd0e35e802ff6b/40771085940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+largest+river+in+africa+isPDF 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_off0000feac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 17008 bytes
SHA-256: f54d365251c17660de285c33b7a8f140c67c100d6792b253cf031960ed367782
font_01_sfnt_off00012b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14376 10524 bytes
SHA-256: c0c6ecbcd8e08ae29f97956ce7d1d7a3b9923e62c2927b63a6897dbb21d35433