Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3cf53081d2dd5c7…

MALICIOUS

PDF

87.2 KB Created: 2021-06-26 11:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 875ba4e95767cb8e398adb63820acfd2 SHA-1: 63e32ad58f0af13127c9119aa97429c4dbde2941 SHA-256: f3cf53081d2dd5c753aca0c4dbf0b39e8662eef3be6f109920002e380a121e82
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to host or redirect to malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a fake invoice or payment scam. Although no scripts were directly extracted, the nature of the links and the ML classifier's high confidence score suggest the PDF is designed to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cortabellanews.com/userimages/5703101540.pdf In PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/86b0fd605abf0f31d0f4f44903220e23/94782261273.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce13c00e221---65132086835.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/vesufiwupemalerezuje.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/boxakifalefixotewijaboka.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/76fe902a8c2dc86d26f095b1f5d82333/57723573641.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c8f7fe34cd811fde99b48ad8c1f220b8/juwaxizivakazijibaro.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cbc024d9d---63989374276.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9eebd0ce0---romedenosivi.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/31011092984.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ec5109a3---79986581542.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/86580213100.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/kirobavevojuna.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/vinopisekupesumaf.pdfIn PDF document text
    • https://arerp.kr/data/file///pikekipevoredig.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaee9e8a6bc.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa43103dbe6---17368960931.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/25842351888.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083351fc8896---rujugex.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7662eabfa---fujuliginumexusutodugopim.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2ec32f0fd9a6ab751ce4aafe846bdafa/rukelowopesokalujibut.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0dc86adeb---24219563193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=invoice+format+in+excelPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/revuwob.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_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 10448 bytes
SHA-256: 9bf16b59640cc2682f5087599affec6038fa73aa252ecd3b58dbf7b9c67497c2
font_01_sfnt_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 18148 bytes
SHA-256: 41d7ab4e5a16260e2d68c23f599bd1876e1257f33eed8c660955bac8c7560455
font_02_sfnt_off000137a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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