Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19d5305203efbb2…

MALICIOUS

PDF

76.4 KB Created: 2021-09-05 05:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2adfa8fd5f3a7a54256fb75755d85230 SHA-1: eee77533893c7c6597bfa049f2c4e72b4aba9ea9 SHA-256: b19d5305203efbb2c1d1402e0b59d1a972feab6da7a3cffb6ca37041854213b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF structure point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=company+portfolio+design+pdf PDF link annotation
    • https://cgeminfos.ma/upload/file/dafijutoxiposiwut.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/10895781448.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd51fbe2c02---34646250248.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/56ca8f492ac0d840bb95900acb7ee057/2194369774.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/lazov.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/buwokogexozudamorilixor.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/baromilevowipekutumupow.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f21d2d5d7---nevagafarifakapikozofapu.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/bawanakizazogevaxezema.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/52617229167.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/58449884767.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/926qqu05jhs0lquq56cmvdf3e1/8002685297.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094610ac6e5a---sajubusebemodevunipa.pdfIn PDF document text
    • https://securitydm.com/slicice/file/sigamokulipesotizazemir.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/94469650575.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/lubulisezopalore.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072257619177---91658521269.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/xukudadorifa.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d1bc8c8e3---molarunixolinogoxes.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608374d81331f---verovuriwe.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/49146748125.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe1e107a25---tadivozuwesojisuza.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161085b7e1849b---jupurimezezenoxezipefula.pdfIn PDF document text
    • 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_off0000ca89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A0 10988 bytes
SHA-256: 81e9ff3645d413a7eec7c50867d6eb064cef87dac78aea50a6f9675692b8468e
font_02_sfnt_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 15872 bytes
SHA-256: 943daa43d806f6f40db2b5c568e822d8003e51e65452fd27d0cda2cb99803aab

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