Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad54d2f2fa09993f…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 06:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6f48c71db816f99d344e38a732a33224 SHA-1: 0a1b5f8e980a08b8e5d8d914fc9c6f58cb9af297 SHA-256: ad54d2f2fa09993fb304158f1a6b4bbe58da52c69f447f8f7818850025413b1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution, rather than delivering a direct payload from the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=poop+clicker+hacked PDF link annotation
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a32d0a34b0c51b71b9849baa079701f4/jaluvexodedatevalukodov.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/87150083800.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/viroponipekivukozejeb.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/jijeva.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/rogimenotobafolobajuvi.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/72831053904.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/sobari.pdfIn PDF document text
    • http://vititanon.com/user_img/files/vuzumaxetubakixijogutiges.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/73d24509e3615eb814a1e5d47f42d7fd/moxibozukijokatajuwuxisi.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/96004579492.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/lerubugejigine.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/27187845611.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/77548986914.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/42302469327.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/37259845214.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/fotibawivofakalabifijab.pdfIn PDF document text
    • http://starma.pl/files/file/42630201671.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/gilezekumuxuwemetu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144ebe1db57b---pomibejofitafapazegusuba.pdfIn PDF document text
    • https://udruga-invalida.hr/files/20154387827.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/xaxoru.pdfIn PDF document text
    • http://regcureguide.com/files/files/48585665879.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/lajagaketewiwufofojofiw.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/wekopamu.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_off0000b1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FB 14612 bytes
SHA-256: c943e9fffe2af4f22280d7aafa792842837cc7f93a5fe3ab9953d5d12d671135
font_01_sfnt_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 10336 bytes
SHA-256: 4b9479915503cf8ef1c5f88d4d3b3f13d91c9e2c779c494457b5a50582c2fc37