Malicious PDF — malware analysis report

Static analysis result for SHA-256 852a5e269bda95f0…

MALICIOUS

PDF

94.2 KB Created: 2021-08-26 11:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3b2bf5c7062990c17186340d9c9ffe31 SHA-1: bda0313fda09512789bfe5d63b325b502f0097d2 SHA-256: 852a5e269bda95f06cfe40bf704b00d28f7bedd2f03d7ea512c85972bf6dff76
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to malicious content. No scripts were extracted from this sample, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://zebcom.in/userfiles/file/lelakegen.pdf In PDF document text
    • http://thechelseaff.com/user_uploads/files/zukajakoli.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/16023276326.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/relupezaxedutem.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/malezip.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/sezumawa.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/2269126435.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b43f963a31d---kizow.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/756cda39eb2433221b083f9d39520ac0/kozavolazosab.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/92176275653.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d493096299---jorebelakuxebedijewozit.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/70400351873.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/woroligulo.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/galelorubetowagow.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16121a594b23ea---59232075308.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d536bf9ab---73767679323.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908bb4bdfcd---2266401031.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607727c2951e4---19807698062.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/rsbep5bpokentrgnlgi1dur4lr/vinanij.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905d726c91a---wizaximajajaludivuje.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/sexedutezifarexesun.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed353714a7---76263910756.pdfIn PDF document text
    • https://educhina.mn/editor/files/xikojulavaxivejavo.pdfIn PDF document text
    • http://platcometals.com/images/file/jovota.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-08-03/210803181452824006t57g28j73y9l.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/28804014389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=year+5+arithmetic+testPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D3 10340 bytes
SHA-256: 28eff5ab303937fe64caa7cae9e4c5ef32142b4e2883ca45e68044c8478bd95a
font_01_sfnt_off00011136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 16712 bytes
SHA-256: 10de11db1d575410101e3d463475363dc88b655113144de2d2de3327f203065d
font_02_sfnt_off00013c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15467 16112 bytes
SHA-256: a493cf14d42598d256b41302b6b737aafa7e6b0f151a2977567a5726682abbae

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