Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bdca6105029948…

MALICIOUS

PDF

99.5 KB Created: 2021-08-05 21:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eae368d8707b6a4f1a5badcfa1f859f6 SHA-1: 4b052c14cb4e5b092895051c34c7e7c8d9e6eb0c SHA-256: 40bdca6105029948f3ee054084fe4b6412e0a7bd4686174aae27e719e8d7ac43
204 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains multiple embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads, suggesting a pattern of distributing malicious content. The heuristics indicate a 'Payment Redirection Lure' and 'Invoice Lure', reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://coretry.ru/uplcv?utm_term=o%27reilly+return+policy+with+receipt PDF link annotation
    • http://deccanquest.com/konadnew/userfiles/file/kevok.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/tovibefi.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b99b54556fd---zovixaberiwevubalisuveta.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/19363530372.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d0e3ecf81---59414389195.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/43488135565.pdfIn PDF document text
    • http://htwy.com/upload/file/78466306322.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/lufeforoxovupimirumudar.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/gibusot.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074200808da6---dagupegisanigigef.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/62e5a49f107770e4eb81bb7107d79b5f/rizopevepezawelizajimo.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160743446d10f0---lapadijariwitafare.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/fi8tog0dm4agcdikr2upgvm6q0/45330671128.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/52578286396.pdfIn PDF document text
    • https://ijp2.com/contents//files/77319354520.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/6afq5rjbust2hbq8g7ec7mf934/42366764522.pdfIn PDF document text
    • https://phr4u.com/files/20687333741.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faea2b08bd1---denomumefil.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/8608128512.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4bfa438c---44821834147.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/87713458015.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107281716024674.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_off000120ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 10500 bytes
SHA-256: c0e4838d050e82e90d6ae06e3888c3d5809b8f152be5f86a48931631ff10e179
font_01_sfnt_off00013895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A7 17724 bytes
SHA-256: cfdae8ea59f87eeb2cc29d4c70ccf5df31d934d0219017d25115d45e10b23e60

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