Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e4a82b63220af7…

MALICIOUS

PDF

102.3 KB Created: 2021-07-24 09:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5d5daa0d7f82433f4994d467b53e62c8 SHA-1: 50f802efecddc2cb37153c4d093b8c82dcf6914e SHA-256: d8e4a82b63220af7e38e21d87b573e36db4c6cfae717b8774ce7676d8190ba2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of a 'Fake invoice / payment lure' heuristic, combined with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, strongly suggests a phishing or redirection attack. The document body is unreadable, but the overall structure and URL patterns indicate an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://aspirans.com/files/file/jokepe.pdf In PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fb7123a0052---22097004296.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76546121713.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/kefibadutixomixagosopis.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/1980b9d6ab835e387f911ce54f41abc7/visulujepukirekaxilen.pdfIn PDF document text
    • http://ipllaser.in/uploads/88440532912.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3cb5e3389---fawivalodoliputa.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/013cc68bb072c6b8dcd27af0d091aff5/14468246383.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/61171373944.pdfIn PDF document text
    • https://kopari.hu/files/file/21448932880.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607072d09c458---xuvuvolamapoxumeso.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/8119bb9h626el7uvgh6brdk7ne/56987927076.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e495c505---52092597480.pdfIn PDF document text
    • http://hanleyresources.com/images/xogidejagur.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/078dafec294a7dfaa9d257074c6a7db3/39631218293.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609790cec0a98---62069960776.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bb27dc8ca67---bipupo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886e032a700---91963764184.pdfIn PDF document text
    • https://ebooksweb.net/files/file/rotuxewobovezu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f88da492395---tolefumovegowi.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/54588222525.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/0iob05a00bj9bo5j20pc16f477/67056544249.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbd44b232d---wojesaluzuzazodifafapegud.pdfIn PDF document text
    • http://hifi-markt.info/kunden/kronhardt/ckfinder/userfiles/files/zagit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=is+pilar+pascual+marriedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 23332 bytes
SHA-256: 8f4aeda57ab9eb44665802809db18e7f4a17f63223ba66bcb48902b763976c8d
font_01_sfnt_off000143a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A0 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off00015916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001712d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1712D 10404 bytes
SHA-256: e32b635a79276c6ef5be141e65d5024539643d5238bd29fee96395a944484354

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