Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d2298a80252c33…

MALICIOUS

PDF

121.7 KB Created: 2021-09-05 12:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d07578d7f6ac4a9d8c9c547bb0b78965 SHA-1: 179ae3aca4b954497bc5014efdcd60398711cdd8 SHA-256: e5d2298a80252c33b6c8bd3b583f83fd3b90f54dffb2d2b33933cd3afb2376f8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://sindicav.com.br/ckeditor/ckfinder/userfiles/files/voselunedenepirisu.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/g23585o0j7pn545k5p21ve08k0/pireropizaru.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/37987698654.pdfIn PDF document text
    • https://kawanmto.com/contents/files/ripufopivaluripiruwel.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c455cc1b9ee---68926216668.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a060d16e---47878638084.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/5287790994.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/69326741841.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/laluxelewem.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/2e5152dfe3895cfd1c65b46c2776150a/81217498548.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/towugogirigarefirode.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/7f42b8f9be42bcd5797a9e58adfde37c/fabowub.pdfIn PDF document text
    • https://avela.md/userfiles/file/19414946036.pdfIn PDF document text
    • https://parfumzone.ro/files/file/71532242314.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/pvk04cggph6kogefvnqr1heosk/20184537327.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/40438737065.pdfIn PDF document text
    • http://strandedtattoo.com/file/kumolufugur.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/fubaledigegetuperezu.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/27844045520.pdfIn PDF document text
    • http://3q1p.com/upload/file/210715204226000817egcnelwr025e.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/80301eb48d2e018fc1ad0d3288be55ad/sejiduzulepadojedekepez.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/25487163709.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161214da054c6b---40865854030.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/612cefb2d47b0eaf8c5579dbf8dea363/93427575504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=emotional+freedom+technique+%28eft%29+through+the+chakras+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D26 16488 bytes
SHA-256: b1dd8cfbda67fd3aff85eccb74835db59feeebe590617cbbadada33a58fe454a
font_02_sfnt_off00017420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17420 24652 bytes
SHA-256: 9705104ac14e2255ca64ad3844862ce9b2acf24c557660f9f09f4b3bb6e909b1
font_03_sfnt_off0001b49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B49C 11544 bytes
SHA-256: 80698ff7367c991bc62838bf9b3417c17bc97ec3fc083a59af0eeaf200e85b92
font_04_sfnt_off0001cf52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF52 1664 bytes
SHA-256: c737c1571b827a9af515084efd4d135d2c05ce8763284746c5506df3322eddb3

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