Malicious PDF — malware analysis report

Static analysis result for SHA-256 904a06643d3fc03b…

MALICIOUS

PDF

76.3 KB Created: 2021-09-22 15:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fe47286191b3402c3c889f6dcbf55e78 SHA-1: 798ddb6e032c3f5caf1f483dfb0b04a014906f12 SHA-256: 904a06643d3fc03b1b54f43be4a6fb13369d053082609d49dd6e92fc62652b52
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or disposable hosting. The heuristic PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicates that some links point to WordPress upload storage, suggesting a tactic to disguise malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inwebjor.ru/uplcv?utm_term=scan+barcode+generator PDF link annotation
    • http://wannawwannie.pl/userfiles/file/jirox.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109121817008894.pdfIn PDF document text
    • https://empresa-venta.hr/files/52036411727.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/23151387520.pdfIn PDF document text
    • http://bienenaktuell.com/sites/bienenaktuell.com/files/file/godekolojegopates.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/sorunifevidowirowew.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210912_1567FCC34BCCCAEB.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/lulafefajubog.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/26997100684.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/55104842174.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/dodakududizodorito.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0c92ba8b---lewog.pdfIn PDF document text
    • https://kaimano.it/file/60614851058.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/vanufifovesan.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/95226350362.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/ninedim.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/geravosijezexu.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/dezuv.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7c73ba118---98590535234.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161445bf71925e---73180611558.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/wesivezepo.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/dabobojawuveda.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16149582299481---timalefive.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/80758658126.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_off0000c5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 10452 bytes
SHA-256: 8742a4ce68bbf5aac6294c0ba3897dd88df54846848d45e5c74c5972f33f663a
font_02_sfnt_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 17912 bytes
SHA-256: 527753ca0ceeb6f3e6596a36e95769c79bfc3d1ca12eb05b1d2d4081bcaab83b

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