Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d6d9e8b536afb3…

MALICIOUS

PDF

91.6 KB Created: 2021-07-31 09:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca3aa282cc3619016963e5194087925b SHA-1: 4d943b6eb468eefbc8f40b3086e6dd24741d5ee3 SHA-256: c2d6d9e8b536afb37d36d4535f4467d785aa162801270919fb7d7764da573ba7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute phishing content or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crysiq.ru/uplcv?utm_term=what+are+the+rhyme+scheme+on+sonnet+29 PDF link annotation
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2fb8d2fd7---satiwewemebek.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810dd048b13---12024724850.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/2675hqufpm5rr1hlcfp0p26bm6/61296221867.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e7b0c0591---15305489715.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/72748717619.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/v6jud26kjkiitbbm719h8h0eo6/67915440655.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luvabi.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/40592723783.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/94042652163.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/85320626047.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/wuradugojojisew.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba79ed3bf7b---wutusixotagif.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/fononaliriduverovaligami.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d2c630b75---47527600143.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/c68f0b3e67226a6166835a601b4dd0e5/wesukibowudifiv.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/7817090529.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/28195573276.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/54919363643.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/25muedi3rpge31c9oa8o28jkik/laxobodusabotube.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/zotowinovivixifaxek.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/fumafuwibixalomizoxep.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/78254455665.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_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 17432 bytes
SHA-256: 407861e84bd958fe56ed4bac0098418fcc0c6cc23f157c936bea8d679d0a2674
font_01_sfnt_off00012d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14522 10752 bytes
SHA-256: d70a5f3e88bbad0196e98d2c58a9a9638ed9357a72151d374df66cef3cd99436

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