Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d54298e84f0d434…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 00:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: c5b7957ff363e5fcc156347c26fbf1b1 SHA-1: 55c695dd96d1ca45b2f54314f62e9743d563ab89 SHA-256: 8d54298e84f0d434abf8523e9476ad1be696ce51a363fa3be224cf1404de552b
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 CMS uploads 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. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.lipca.com/ckfinder/userfiles/files/vibibawosaxanusivojuta.pdf In PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/bf9ae12c6c4f00136e3b4f4588f61ce9/morixa.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/vapovizef.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/39066753339.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f37882bce1---bojorojaletubukun.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/56371101802.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/foxuba.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///25297955909.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/wedazagofiziputalida.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/75374470478.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/gakepopowakefeli.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/posivigoruxatusuvi.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/91092834243.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9c430c5ef---gitalogidowubetodite.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/fexabubanegebuvozuli.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/86704674905.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/sirupemedobejasageg.pdfIn PDF document text
    • http://chemsdano.com/upload/files/41432537973.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139860cd9d21---bedife.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210909030310_rph6bo.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/99618459239.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/noretire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=soul+watch+online+with+subtitlesPDF 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_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 10628 bytes
SHA-256: 3ad57c4eebc8a7afe04030aeba17aa43e0546a467a70862d12db9f310132b96b
font_01_sfnt_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 18252 bytes
SHA-256: 3a508db2af45afda47e9338a53c90953499c695e254db2d6e46cc7a2ccda669b
font_02_sfnt_off00011ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1