Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d0591a847d9b0f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 06:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c512a096e0f0bd27470a3d0bf9f9374 SHA-1: 02252aa99263f4a6ca1aad67cd0c128a7309dbd3 SHA-256: 29d0591a847d9b0f8ce5115126b7ee04f5fc81a0b9d6f67690d89dcb228f440b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://finalbrand.cz/upload/file/90925069358.pdf In PDF document text
    • https://cplastik.net/data/cms/file/mumigenujusirepinuke.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/vapinifutulawo.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/92390802057.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/37065482308.pdfIn PDF document text
    • http://sun-eko.eu/files/file/23595952940.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/fexiwetebemumijozi.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/xepeg.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/22162655716.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/1c10aadddfe88e5da8ed50162733e4e9/newogugibodunejon.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/18808780001.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/detefulam.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/21484198809.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea1c95854---95897894351.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/51850745603.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1614358b393d0d---fularila.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/68941089730.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sokilenen.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/rk8dvfc34maor8seu9k9hjleea/65141277025.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/folizatolusurepodip.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138282cba9bb---94534664715.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/fifubewasedu.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7dc1c4ff6b8c263fd43ada0923d8f031/78354286814.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/46833916353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=drawing+using+oil+pastel+coloursPDF 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_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 10736 bytes
SHA-256: 38458de3d837311c9e1cffc17caf486ae5b97e704ff9adae27b2bde887f6ed0b
font_01_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 17380 bytes
SHA-256: 92034d3b1f8dfed6aa86daa6f00942ae15316aa3337913f84fc522a5de5d0b89
font_02_sfnt_off0001209b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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