Malicious PDF — malware analysis report

Static analysis result for SHA-256 266554888c3b4b38…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 13:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1595a44be7b08e571efe145c6771ec6c SHA-1: 1de13090b49dc8478f0e078633d54dd60de25ad2 SHA-256: 266554888c3b4b38e438c502b981cd6187c8e5fde6fdf40ed6d421c1ce71e62c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=strategies+in+teaching+listening+pdf PDF link annotation
    • http://ssatripoli.org/userfiles/file/51879872071.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161210310bdaa0---66530530111.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a0eb5f586---kuferagugodebudifuk.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b4354597559---89418665263.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/tufebanib.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/domonusaxutadozego.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e53ba249504a3e880b82ec7ecbee318a/xalosagi.pdfIn PDF document text
    • https://tsegypt.com/file/lezulu.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/62595845408.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///bonidozulagutivunutiti.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/44003593629.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/40987634161.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5ae32c0edd571e4be46a0b548ed01871/wepenopegomovonifa.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/40139205616.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa3bce4a2---54256159678.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/70283708407.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16114e7b5601c2---52315305574.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f5147f7013f6fdd838759b1be433dc26/1081260225.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112acc067368---12489329889.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080969ec8cf1---78133697127.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/gidilosobodulefuzuxolinav.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/kunazawuzejiwomefajejifaj.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/21211252408.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_off0000e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 10852 bytes
SHA-256: 406198fd439063c0720780839cef8e1dc6aa5783c08ac58026c8ca9d3be5ece8
font_02_sfnt_off000113dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DC 17232 bytes
SHA-256: 053de64ffe2e3f48ff1bd5594327483e2bc1ff976e62c12ad761cdcf8ca3bbb1

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