Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5935a4402a6b105…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 14:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d1dfb2badb508d6becc643e57eba38b SHA-1: ac283196c813862ebc94caf8604229824451f6de SHA-256: e5935a4402a6b1051d26dd26391b362297ca8099699aefd902597fa333d6c938
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed as a link farm. While no scripts were extracted, the primary function appears to be directing users to potentially malicious or SEO-manipulated content hosted on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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://habibitours.org/ckfinder/userfiles/files/64846991473.pdf In PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/xiwon.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090132f39b2b---zukorixerisazuxawukejava.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/furirasobovesoxasite.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/vilesab.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607072ad5f6a2---veraxeraji.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/39237314244.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b88564d0e2f00a938381eb88a3e276b8/53925159265.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c3d7cd81bc6---lefofoxemowan.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bf24d98cc---vamopibepud.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/3cb258e00cee7a2d6a747d44c5f0cded/vudisebugaj.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ed0331e68fc1fe637460d224cebc126a/74736696856.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607af0eb34042---zodizapedomaraduti.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/tepulafojiwibev.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/luvefuzeva.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b621858ba3c---73711085949.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/7636734613.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a599a2dfe---zojaguvuxotejav.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a44aea2c05e---bazefanor.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/892b01475dbe71da2ebfcf31cf02c011/86621485793.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab9347dc96---sevexonatetobozu.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/6jljdivgg6ga1g5g3kcsn7r110/vukigipuva.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/dilisamafepoxujotusigiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=taylor+series+to+function+calculatorPDF 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_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 10508 bytes
SHA-256: ec294eb2daf3d48d8f172bc80e99b6a847146f30ea83691eb151f53bb1ebe1f1
font_01_sfnt_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 19400 bytes
SHA-256: dd5f52e1da4214d1d83552e831cea64eb9a1cecbb3b1033258731ffe8e817967
font_02_sfnt_off00013624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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