Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b3f98b12ed12ea…

MALICIOUS

PDF

79.4 KB Created: 2021-07-30 23:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0cda94f8f066ec95c1aaedb7bc4427f2 SHA-1: 37e9d5d0102e8cb8ea67ae1947758c132881fe92 SHA-256: 48b3f98b12ed12eaf7b3becc293c0db5b616033381f2dfb7448ce68b37f410fd
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using such sites to host or link to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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://philabc.ru/uplcv?utm_term=strauss+waltzes+for+easy+piano+pdf PDF link annotation
    • http://alvirne88.com/clients/71477/File/nufikafonidar.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/29127553156.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/46fab4b561164cd17df9f14303fe5585/mulimevudomozonojigegerav.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/73037354660fdef90d942c.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097fe423ef13---wilozesoxujirobojafewatu.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608089edd45c4---38444481256.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076f027bfb83---vasukazinuwedeke.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/99377241228.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/90660382219.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/wologovaxuselopirunuwak.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/xerazedenanozasefu.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/48515201264.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/38130241357.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/0a02862171f233c30b9b1d55fbc4a488/50270298803.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/9524272754.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/73971097121.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/jobawerubunito.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/26075619042.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/f417p9lr2rjnvka7km3as406tp/87038052851.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cr4h5erei3u3t9qsq61oko7ok7/pinana.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/10204385045.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/luxibaxizimogu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21bcf45da3---mujimubuvatowelugiki.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_off0000d047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD047 17424 bytes
SHA-256: 11b2b5e842e63666c0770bcc07abd23958a8e508bf3f984f7d3c0104b5c7c21c
font_01_sfnt_off0000fd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD48 10924 bytes
SHA-256: 0e4a51b0b085b36d3d900eef05a41e8a6a1221d1d739109e0257e52a02868fbd
font_02_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1