Malicious PDF — malware analysis report

Static analysis result for SHA-256 87989f45d72b788f…

MALICIOUS

PDF

85.0 KB Created: 2021-06-28 13:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b45a5e18c0e10d00271c82e11656e72b SHA-1: 66a8bdd052a975d0558d028c99a889b8898db749 SHA-256: 87989f45d72b788fe7f728c40ffa85ed2a4c166ce027b15a22afff357406175a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external links. Many of these links point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for malicious activity in PDFs. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alamansyria.com/userfiles/file/3975054946.pdf In PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/dd6d5e4ae57d2a013530c84b45a6f15b/zajufefi.pdfIn PDF document text
    • http://superpart.com/files/49675631385.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/76780283989.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607007f9dfece---vovagozus.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/juvebobalafilofovusabokaz.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/57466708239.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/menorijinifutusebez.pdfIn PDF document text
    • https://premium-house.uz/images/file/sewobun.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/h383k20hcasbsfk2sgeoq1gm7r/rovijebokezoma.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/28889542394.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/danozika.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f639e57a84---konoligupadegeja.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d74c1ece14f---vagevaboditafof.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609251c9e3d57---xelatepimaxeg.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210615033107.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2d6e2e204---keborogujekexakibu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075791ebf91a---musuxokumam.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/0974ef18b91e594d58abd7e60bc4e35b/87512955251.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609abf98a3849---kabuxawagujixubavejik.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/65392525874.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ebf98e078---33345545620.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/senaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=steps+of+faith+in+the+biblePDF 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_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 16724 bytes
SHA-256: 0ef39483acb6e2ee9fabfdd2a74b9f07798af73b5d606b8722d110b44bf6317c
font_01_sfnt_off0001172c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F43 10568 bytes
SHA-256: 09dd7dc5a97de7a390f5b58ec9e631495ccbd50a92eef0e0c637eecea295d87c

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