Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f6553a11739d49…

MALICIOUS

PDF

107.9 KB Created: 2021-09-23 06:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 08ab71518c3d0b25553b022b775e3b03 SHA-1: d37ed8c74fbcddc3fee645291890a3f3b8f58761 SHA-256: d4f6553a11739d49a14aaff48612784f77b88a22deb740f302336e8627840994
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://dalieuht.com/app/webroot/uploads/files/gusexanapufone.pdf In PDF document text
    • http://ecohort.com/userfiles/files/60775565098.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/36084819042.pdfIn PDF document text
    • http://short-story.ru/upload/file/gulogamonovi.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/3543594038.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/33767331105.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/79516633924.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/dowurukewonajapepexuna.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/82ojdcmem35vl389lupg7a7kbh/48361305786.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20310477525.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/98d5f35a99e49b05d90e7a88bd8190e7/34724675883.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/gedexapeta.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/jazuxinalomabodel.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161434d39e7073---melevadorusotakudagiven.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/27220499085.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210908_07FFB39110CD9FD3.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/17716236731.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/79898209832.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3df3ab041079d187884e24e15437bf26/mesaliponogilamuwu.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/46031510958.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/wojugezabesizubax.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1e7b80fe9ce52d95ceb1598fb770d8e/ronoxi.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/64351313673.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210916222831.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/79vgm8mfilkm69ovtegvpkal47/13365962635.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/77962819963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=harry+potter+ebook+downloadPDF 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_off00013ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF6 19344 bytes
SHA-256: ea86826ad9827b4db2281983b0f2b0e52562ef8ee9399422ebf7f79deaadb6c6
font_01_sfnt_off00017187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17187 10548 bytes
SHA-256: 4a55ad5e0ac890c00e38a39e4852e6ca256e84ff23f584ad79097bd86e83c5c9
font_02_sfnt_off00018980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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