Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad467fcd37f08e6…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 13:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b6973ce6ac566a90ea11c4e56c1966a SHA-1: c1e7dd31c9f6883b82c620e88bc2bd02438fc9b5 SHA-256: dad467fcd37f08e6ec1e5d036608c35a8946856e4d403e15309181f50cfda47b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=how+to+hide+installed+app+in+android PDF link annotation
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47f5f0e69---sewakukawa.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/67205237660.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/fidowafexidi.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/vofumixagi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d3a0b98a1---zivomelazutujisusozabolo.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161404a7f8907a---35750428846.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/bubumur.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/sapimu.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/8544977849.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161432ed31f735---99180444591.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301cc812c8e---34144892161.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6fbd86b632ddd2a8cefacafa57e7d0be/mopasejo.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/94629975562.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/defoxilebubagezokofir.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/80116904227.pdfIn PDF document text
    • https://lesura.net/userfiles/file/42153064068.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/34413185998.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/44924454897.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/kuzur.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/88280624516.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f302e08095---polutavefibetir.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/46721873220.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/ragoz.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/kivos.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_off0000b3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBED 10568 bytes
SHA-256: 5676e790d751a21ac37d0b42b8ce545c7e77fedb398936ad23f33fc9143b3915
font_02_sfnt_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 16248 bytes
SHA-256: a5c1db193005b4704d92f5c5fc810bd623e81d498b185430ff36f6850f56f136

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