Malicious PDF — malware analysis report

Static analysis result for SHA-256 8996e09808e8c8e9…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 02:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9cf394faf28a8b24ab2c497f1d68eb1b SHA-1: 76c8c477c377fb6b09e62878d36f8bbf31c913a7 SHA-256: 8996e09808e8c8e9304d952527cc98a60cbc3e00dff77436b0cfc62145a38f9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to potentially compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.keizerco.nl/userFiles/file/lanizuvigafojemodubi.pdf In PDF document text
    • https://takipbizde.com/calisma2/files/uploads/51717331326.pdfIn PDF document text
    • http://autokaryszczecin.pl/userfiles/file/ladigojuzapejoruzibita.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/13413258983.pdfIn PDF document text
    • http://na3.it/misc/file/21324995168.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/16980399325.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/18q4vpn8vt7bq6nen6f7hja1qe/26200666314.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/95194676613.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/72739049129.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/wesirumakezowaguvati.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/panujikitotujakadejagar.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/66320951809.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/60882867337.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/6722165338.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea722db76e---53023299817.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/l2c9f7na30tgcqpn7tfbrnhd5u/67423739811.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/65836d501670a848ac2e5edd6fe46c0d/49351301634.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/35383858617.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613d91c43a402---34445343015.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bdc9849d2---repokogazor.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/naviburunikefizedowigufan.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/1801547015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=u+into+v+rule+of+integrationPDF link annotation
    • http://irodori.kir.jp/files/file/564196530.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_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 17800 bytes
SHA-256: 5cc2e2932bff8324d1cb09ac9057fb252959e04bef3f77001b28d95c472605cc
font_02_sfnt_off00012a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1D 10392 bytes
SHA-256: 53f0cc0286a25539080cd1e8a6f8c07967fc4ba1bc7f334940a567bcb229c39c

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