Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ebcc41c695f7e7…

MALICIOUS

PDF

90.4 KB Created: 2021-08-17 13:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 071f403a97be680e539faaac5d471839 SHA-1: eb10170c01e2a115697d35c63c6bef75c4cb5ec4 SHA-256: 99ebcc41c695f7e70b25cb6e81989110d9f06f6cd618c6640b7d81f98335e2a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites, suggesting an effort to obscure the true destination. The primary goal appears to be directing users to potentially malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://biotop-zamosc.pl/userfiles/file/14959846854.pdf In PDF document text
    • http://lhs1965.com/clients/880801/File/jalofamuzip.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/19292571443.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7d12d2b2b---69346837312.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/rinokadijadixefapikemixuz.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/37977721004.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/32345955089.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/eo4ub3i1kengp8oephi2cffm7l/buxona.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/32e53e9427a42246651dce3197a53c69/ruwavag.pdfIn PDF document text
    • http://scriptonica.ru/files/files/powupupolowexoguta.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ad733c27963---fonowafebevawufibalo.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/54716437329.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/padinadoduzuviwagitegutor.pdfIn PDF document text
    • http://cjatkinson.com/userimages/25538904405.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/68532049012.pdfIn PDF document text
    • https://ebooksweb.net/files/file/kinonisarasutagopumad.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/766e49ba5b9acc8327739a0e69433897/vovutabilamopip.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/mixuz.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/tojezulefete.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939fdd59ce4---xupufema.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/9nim81ru6kh86nbjocbb7auccv/54509432148.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/12540329218.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/lekigimuta.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb32b1b2357---sunev.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/7801471994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=como+convertir+archivo+pdf+a+word+gratis+en+espa%C3%B1olPDF 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_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 11456 bytes
SHA-256: 9c5ede43442cb3499f272c4341d9c9cc7ffd14944f5b5a0bc6deaf164cc515e7
font_01_sfnt_off000111c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C2 18376 bytes
SHA-256: 2bcac08c4a7d3afb09ab8cee49d1ab22b274a2ea1b1874cc3777478556213620
font_02_sfnt_off0001404b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1