Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18d8507b0431c03…

MALICIOUS

PDF

77.1 KB Created: 2021-09-23 18:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 97d773fd05a596f125fba67dcc75d504 SHA-1: ba6117607642bb771bb0264fbf10c092672cc4f2 SHA-256: c18d8507b0431c03f6e009ae414dee51a5287b2e2fd7585305b1de7e2aab192e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such documents for SEO manipulation or to distribute malicious links. No scripts were extracted, but the PDF structure itself facilitates the redirection to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.db-ynox.fr/ckfinder/userfiles/files/gokakumapuk.pdf In PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161376532714ae---gilaxenagurebafunaxumo.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/puregaremufibotaw.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/goranavomufavomuluwixoxi.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/wajap.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/2664987470.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/c4dd58d4d04f3ea8b2c65bcfccc3fd34/66926545307.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/56474833376.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/44793216044.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/c1vsn8ltbbfl9kmi4est1nnou2/zapewazenokaleniweg.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-13/20210913132454672753.pdfIn PDF document text
    • https://badoza.net/userfiles/file/nubulib.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/49147253449.pdfIn PDF document text
    • http://cycling-software.com/files/file/baxegufogevoxojuxawi.pdfIn PDF document text
    • https://coil.hk/upload/files/50541230736.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/85576780327.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/tugipagakijugenasosatit.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/lenamasegaxoxudujinafoga.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/mazalitaxisofalil.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/kexizef.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/5932962991.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/71754538431.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/navibatudenepapaguxumik.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/tunoxurilobog.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/vonafevovapugisuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+live+wallpaper+makerPDF 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_off0000cac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC4 16956 bytes
SHA-256: c7d2be69d2644fce4ad1d4d9fd5123b3084531fa233013cf7519e6223d4f7a08
font_01_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 10484 bytes
SHA-256: ded1d146cf2198e19b365aedc56252b6f2e39cd371a507ba983f7a40dfa7ee05
font_02_sfnt_off00010e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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