Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a8b0738324e9ba…

MALICIOUS

PDF

92.7 KB Created: 2021-07-28 02:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 57f5eba42ab3f80451b8fdcd505008c8 SHA-1: 31274db243eb9a2740a7a71ca36cf887468e7c05 SHA-256: 53a8b0738324e9bab7f38a2b0595c6a902bc45bce6858db6bb10f3c71d381859
164 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The presence of a 'Fake invoice / payment lure' heuristic further supports the phishing or scamming intent. While no scripts were extracted, the overall structure and URL distribution indicate a malicious intent to redirect users, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bunyaminerdemir.com/resimler/files/27423983441.pdf In PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081c7453144c---porogipubo.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/28989687424.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/13996054234.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4342632e74---56500267547.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5qvoilgi7u97cgamu7co6v3c37/40421709268.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/jidupi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080d07059c52---59150016107.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210606042803366815.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160863867623b5---mijopelaka.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160afd65dbb89d---ditotuwikexi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c2735a299---pegogeboxokufopup.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4d56e747d4edf61e36a9638707c8633b/117682321.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/lebuloragobozovagexakiwu.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/powadowigino.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/74356510676.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/lesuvi.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1b26240c4d87f7b6674daa028aeae00d/34099910454.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/tuferufiwaxor.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cf43b73bb---2798929418.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072554dda1a9---16433311379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=financial+accounting+9th+edition+weygandtPDF 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_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 17824 bytes
SHA-256: d6589654b5a9fc1fc0d33ebb66baa271edcf1f94b9f46687a73864bb37a07124
font_01_sfnt_off000131c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C3 10828 bytes
SHA-256: bccf58bfae498e149bab2838f37a09789147538c950d37317e5b632f7e8a3b8b
font_02_sfnt_off00014a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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