Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df58641d63b56aa…

MALICIOUS

PDF

143.9 KB Created: 2021-08-24 17:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da549624caa76376116e93d0359a9d5e SHA-1: 5e54024ada764dfae6d1da94ab4bc0ae606ad02b SHA-256: 3df58641d63b56aa87aaf409aaf59ebb9cab1ac1d49d02e0c2bf4e80e84f15dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://crysiq.ru/uplcv?utm_term=java+one+word+questions PDF link annotation
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d68129604---xinawurisobitunupok.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087fba79c43f---nerenujamojibijume.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/perukajoxizixape.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8087e5919---39145865928.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/3370578919.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vabarajodizu.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/ludadawaxujowuneso.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/77770384295.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607affa328745---genuvuloxovejabupoze.pdfIn PDF document text
    • https://dm288.rs/slicice/file/59315312441.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2c8521a7e---98085503845.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d96ea8c6cd---sefagi.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca7d121cbd7---dukitikutasowezepaniwipej.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/55097953470.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/7049353145.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/70909705337.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/49099889617.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ffc93a052add009c044704839f35e321/mamebosogawamome.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/546baee711e1ba720f42ab0f39199872/75518851041.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4008fe3f99---boluv.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/pulodebotop.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a653a3422---58090496585.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/0955b1d04103ad67a7580fc3d6460b97/60456525450.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210807170532153.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_off0001cec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEC8 18664 bytes
SHA-256: 39eb28e42979b28c023bc62be57b82ea65c4bfae669928814106d5fdec439b1d
font_01_sfnt_off000200bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x200BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000218d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x218D2 10584 bytes
SHA-256: dc3478e592143d9a5973247e6b91dc66ae1b0507a64c8bcbad246d0dd104633e

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