Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a5b0539e8bc9db…

MALICIOUS

PDF

95.1 KB Created: 2021-08-31 00:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3bf1d2d0798f00d10b1c39c9844e2eb SHA-1: f604a7d70215b211d2396f3302bdfa6a1991f1ad SHA-256: 82a5b0539e8bc9db617d8897f9efa0c989d44604d8315397904dd31c3abfd692
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, likely serving as a lure for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://interwork.sk/userfiles/file/waxibexibovegokemo.pdf In PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/14701067085.pdfIn PDF document text
    • http://kyea.org/imageuploads/41764099142.pdfIn PDF document text
    • https://icbacademy.com/upload/files/35933153728.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611d4730dfb1b---sepobo.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/46860992776.pdfIn PDF document text
    • http://digifast.cz/userfiles/gofowibuno.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/ba465255204e9551956588ad7dc89a96/25026970517.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/5f7de41ed913716906dd8a018cace209/bezuk.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/cd29435c17a5f534707c82bffd4b8c0c/nifokufoxopisufu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb86931e91---getumidigi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb58dab743---77857492605.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/75024079459.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/2123243349.pdfIn PDF document text
    • http://ournextfamilyreunion.com/clients/4/49/491fb30de6d8464ca6518fa43aba5bd5/File/piruxobapim.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/datowupupuwakejekep.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210810035723.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210701_4FBE8904B0042385.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/82134620285.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16078acffe224b---98527789490.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/temebiwi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3836aadc67---10886515627.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/xutazegotuzodigo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b45c32b73b8---gopipojesanaz.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/kesiromojupirimevokogef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=find+matching+data+in+two+excel+spreadsheetsPDF 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_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 19392 bytes
SHA-256: 947a4d948051e84c656cec2cbeba57e28bd1387b487a7714ddffc0ed55276228
font_01_sfnt_off00013bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDA 11128 bytes
SHA-256: 39ecb609b9a120e4d07f08308fb970a7179a4286924c325243505d01a603f865
font_02_sfnt_off00015575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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