Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff9fb58c80c2452…

MALICIOUS

PDF

91.9 KB Created: 2021-08-09 23:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ae74ead40f6c2c907b15b5b36e02b29a SHA-1: 60ae1d835463c1d32435baa59ebf3fd81bb411cf SHA-256: 3ff9fb58c80c2452c4ad42bdba20d9444d74c783123f075906a7d28414e15084
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing second-stage malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1d3b2aa27ecfad0b96ec9e238d8952b8/95032511011.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e60a957a2b---jedoviwakowebiji.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/15145178542.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b90b87dd15f6f6283b15d5adb52fd4d6/risefuxufadipi.pdfIn PDF document text
    • http://prestopc.it/upload/file/23127901352.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fbe31cab6---xemurefezuwiwoxafokiwa.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/78107244993.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/zuxazik.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ou317nrguhj55pt7mt2r0m0q46/35020455543.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609df217505f2---25577682855.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/17043640746.pdfIn PDF document text
    • https://0900107678.com/upload/file/99061940364.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/r8tvna52i9b4psm341ec220f75/linaloxutogudi.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/80222995242.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/0i7mbbl0mdbl5hl9fgoarfhmsg/43330894778.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d1eb3c8349---58874261493.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/pafexabadopi.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/bejazesubedit.pdfIn PDF document text
    • https://bachson.net/upload/file/fubutafamutarixe.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/xotodajiduwinalewu.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/kisiraxas.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/497b76a679b63838c6d05b76052bbbd5/94738376568.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/womivefilugotenemorexovev.pdfIn PDF document text
    • http://thegioioto.store/upload/files/23036430747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+book+costPDF 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_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 17172 bytes
SHA-256: 8ec3c6da56d29057229df59fe7e286eb99972419a2b7d63bf9b04528759d68aa
font_01_sfnt_off00012fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA0 10984 bytes
SHA-256: 767538ed9e7ea6c9e555abb7e1fee08d5ebc8286ea5211a0b08fa06865f9a0de
font_02_sfnt_off000148db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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