Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b463f4d07dd2cef…

MALICIOUS

PDF

88.2 KB Created: 2021-06-27 06:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4be86a1b3a9078853815bf1f547cee65 SHA-1: a5930b28a238f6ce5fa7fe940b47f9765ab7c571 SHA-256: 9b463f4d07dd2cef087395a645f3588260fbae6478823848d9c9add8cb14e214
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a focus on directing users to external, potentially harmful, websites.

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 https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4d16346852df221a99a8f8392a221038/rotexofomofa.pdf In PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/ganikaxomusokituwevumik.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097245c1c4f7---pibul.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ec0dacf8e5c02b35ab433f85a3358e1b/bobirolubo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd3394c535---soxafikovukuzalida.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088070845f14---balovolunigevif.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/tme3c367lgi228f6372pav9uhk/54252593166.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/hij6qnbosriov20h347pdgn9q3/71184839315.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/nng0kg9laufmlphsdmnofe932l/12991266089.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095726c37125---30301200505.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/66965178053.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adafa012dde---panibolifogifom.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/rokepofejugotaxusumeta.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b070cf289d---83017243734.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6230e400b120ca22776b94bd0e3c10de/26621766997.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/fuzen.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/86972993657.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/303a932410b5cc6454fbf2af0c2723e7/waduxavubipabom.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/m3kla7i3hpb9d6cp4nrf5nb0cs/78161182787.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608003eceed22---vudezanisedotonatupawiz.pdfIn PDF document text
    • http://skncn.com/u/files/82820478741.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/madoxokegoguzabadavufilu.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0ed80233d---fujogajutam.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/wudapufipiwenubodomiponu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=nude+long+coffin+nailsPDF 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_off0000f82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 16696 bytes
SHA-256: 8dd4301cd6ce810b7bcbce3722142e2fb9b6414f3e5570813f95acc74820b0e5
font_02_sfnt_off00013bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD5 10528 bytes
SHA-256: cc823bd2f10cd6ddec28d4368fbae1e18fca6a2e3165b81e77f89e5bdcd0e422