Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbba3d520f5227b8…

MALICIOUS

PDF

108.3 KB Created: 2021-09-05 02:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d53e8fd5cf317d5a465e974f7065d0ad SHA-1: 4b226b35d72f838663827a1004eb5e152d9f20b6 SHA-256: cbba3d520f5227b8f4172e8bbfb4fb1fa71fb5d82afee5ee9b61f638934a98e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the document likely serving as a lure to further compromise the user. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://avenue102.com/uploads/file/gubojetorudexenotavejag.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608646118c89d---wugumoviwotoxugixakisove.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161054616f2ccd---71728041407.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/rerud.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/32598987308.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/56857173035.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/dabaletawetanomosepide.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6e8e824ca59557918c825501b57b2f71/dozoxojamibudale.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/baputiwuwe.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f2a4f9fb---62886295919.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/65317277630.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/rarumuvutizud.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/4120172750.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c5c9b0ec3969dcc0518b75646241cf83/11155058425.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/disjo670qtb77lgghaml2jbc8e/pewugukuzigilebaranolalo.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f684999d8b---31275720536.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f326812bf0---kebojerefokijonuko.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/towosewulawubi.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/nofadivilemubepobumi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ab07e730e32---94966497190.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/9896411789.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/be1f4a984887c5cef8790e1dd7586eb9/fetuzixo.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/kgjti71iu8ah2n5c15n00jue63/90136019153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=fault+tolerant+systems+koren+solution+manualPDF 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_off000139a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000151b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B7 10552 bytes
SHA-256: f438183f6be1e1ea51b7d13caee4154f814bc178183c5d3a5576c40f29069d4c
font_02_sfnt_off000169cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169CB 22788 bytes
SHA-256: 588b7f1075337638fb80c18fe6cf2db5d4edb07016c0ca743584b9ce69000e06

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