Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45b5fd7a927ac6c…

MALICIOUS

PDF

92.2 KB Created: 2021-08-04 19:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc6e8ce69a7182968251fc0537359877 SHA-1: 159f67432593633ec5479b7281833c488740b5f9 SHA-256: b45b5fd7a927ac6ceb22b90fbafad9e1c0cca711400cd1c0cb244b0c7e54df32
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable or compromised hosting suggests an attempt to obscure the ultimate destination or leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc90dc77ef---43722395922.pdf In PDF document text
    • http://dui-antidote.com/images/userfiles/file/vopep.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/31984540288.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/vuwusinofoponup.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/2132317065.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/es6oni52c3rf7gufkbc0jt1c7v/xamotezureve.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/63478002539.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/talomeg.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d566de3af95---winovafal.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/64751485769.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/32274973416.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/12316168256.pdfIn PDF document text
    • http://maihome.hu/admin1/file/99714530193.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/musomixagizilezopal.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/7f76a6e61eff3db868e976a00b30bba8/81014197974.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/riguzobulidotigujak.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/099499210c8868805092ee34a1ae9e8e/dimexewameliravigotegobom.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/87400148145.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/zovefewizi.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a2932ee58d8---rijapezodijan.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a95a0cced8d---76521642993.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4590531e6472bb6cb0cb5cfc91f7f600/zajomaduxunatabivoges.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/5241cf4d12eb8d742a0882bd3cbc85f9/86281902923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=christmas+powerpoint+presentation+backgroundPDF 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_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 11364 bytes
SHA-256: a4d42b920671e366addd4acee8cad49cb62f18e2d474beb64c48797061691afe
font_01_sfnt_off00011b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B07 17696 bytes
SHA-256: 1376f35bd542c2ca99022edb5c077453fb4be386ede50a191ab056ace9fe843a
font_02_sfnt_off0001496d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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