Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e0bde21ab2c744…

MALICIOUS

PDF

93.3 KB Created: 2021-07-01 11:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 011ca4b58ff27bf13f95ba7272ee86fc SHA-1: 663964dcbc0ede219e0b340807406aaac4cc562d SHA-256: b4e0bde21ab2c744095bfda83b6eaa437871689b581be387cbab8933f283ca17
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, identifying the document as a link farm on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studiobaldizzone.com/userfiles/files/98226264286.pdf In PDF document text
    • http://redigonda.it/userfiles/files/31287627584.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0464d0794b6bd115d06a4287f8de662e/jogez.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/44134981454.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/suluxo.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/9995c6b3377e51adaa3c28edf7119393/jefoderulivobukuniseno.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/i98ledomegs203nbgqj1ubcn3l/fevamamofunovuzuvupop.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d2bfbf856acb099eda4ba182f6420d0/2049420532.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/lajewaze.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/5d24gjt52l5ssf5865e61ju3c3/37327372975.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdad0274d73---43330940989.pdfIn PDF document text
    • https://italvaping.com/file/52211714035.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/d88beab3ef75886056c090f7a09923ec/42971828950.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/duxoxo.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/gizarumebilozuwilade.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/53ffaf304df3e0aac65c24cdf4c8df15/gebuxijugudenopet.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96fbb8d83---24281444470.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/6953li3sr70jfejdl1ctu0k0ue/gipiwavefutemebipu.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/puxubimowizo.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098402d00078---fanimodapakukozixogiw.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/e64bf4a13492bd0a5ce169b16871672f/41576025001.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/mosujaneluvajab.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210627_1182190AB32F0D13.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a17d73c04d4---filirajonugisenuris.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/o1fcgtjf3j4eevaq3bjnl9bupm/nudutofilujuraxaxivuju.pdfIn PDF document text
    • https://airbays.com/userfiles/file/18825269167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=senior+high+school+questions+and+answersPDF 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_off0001097c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 17124 bytes
SHA-256: 26598a6a2737609ac4e72daf6d5f0ae0f8106f272c92e1331630bcacd6420b75
font_01_sfnt_off00013630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E47 11056 bytes
SHA-256: dd7642cc40c1bdf7233467136e28275e8681aab027b072b5fdc56721eccabb1d

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