Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc442d5d8e00a28f…

MALICIOUS

PDF

92.2 KB Created: 2021-09-05 18:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2779043c738874a44cbd2dba2ee191e8 SHA-1: 10ee9c3b64773f0162da87fe8ab9bed0a55baece SHA-256: fc442d5d8e00a28f920f3ce0d4db21a3483ab9d1677cfc3c934ac239941e71ab
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting domains, likely to distribute further malicious content or phish for information. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to blend in with legitimate file uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://asiarsolutions.com/userfiles/file/dukijarik.pdf In PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/da7b458779efedb709a11c5372e50ccf/zigolomu.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/34336124263.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/poberufi.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e68a7c8fe49---vorunafepi.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/rovifapavubalaxozibutowu.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/67304758736.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/2325788352.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125f87e39b7c---8766453779.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/97247191791.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/68110954855.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/pevegoza.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/31585676595.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d5536abbc3c25f89ffadd858ccb464a5/tuxogewinejovelumasit.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/a36518031fd6d2e80a543fd7d4dd2e2a/leruzezominonuzatomu.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/210d95ed5a0f9c8e61bcdd292c34ff05/71545578588.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16083ed1d6618d---17731314946.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/48430827735.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/30406087005.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/43193137291.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b102aa8376c---feloxud.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/71725074891.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/18486161384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=siemens+openstage+20+g+manualPDF 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_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A2 19252 bytes
SHA-256: b152880f358f1f30647312b9e9b2e5210abcd7e3bac96bd98bb0f526392b2123
font_02_sfnt_off00014a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0A 10912 bytes
SHA-256: b351e7a56cf0bcba76826078358297487647cf27b32590fcad0618d0a6dae846

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