Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa63497df8569c6…

MALICIOUS

PDF

76.5 KB Created: 2021-09-15 20:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd436ce7b54caac2259adbc2911227c3 SHA-1: c9b1fb0e1e58fc3009feb6c063083bd558adf6c1 SHA-256: 9fa63497df8569c66a3db2d1004e8da3e858b0fe9a6b5eee775717a9dfe4baae
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed to redirect users, potentially to exploit kits or phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://abwlanham.com/uploads/files/furus.pdf In PDF document text
    • https://brihat-group.com/assets/userfiles/files/37520999122.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/suvuzorifez.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/tobalalibi.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/kirevopufikile.pdfIn PDF document text
    • http://ilovestory.com/upload/file/dumozazami.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109031905552062.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0009e3c0668fddbe3facf4922f8b0002/90625968419.pdfIn PDF document text
    • https://cubic.is/userfiles/file/mumoziridusebovirawu.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/kaselopaxoseno.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/madegisafemewewerasif.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f9ee23846---suritotuwimej.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/30764530943.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/92082647592.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613040390141e---68483071654.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/4465885224.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/zetufewenuzenov.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/lubirudebuzovusobobuf.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/muxerel.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/nalufufefopano.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/30500014436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=russell+simmons+super+rich+pdfPDF 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_off0000c4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE9 10768 bytes
SHA-256: c6fd69d2352448f837f2e1f909565f3b6867ce48aeee2a6361683fc5442fb4bd
font_02_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 18128 bytes
SHA-256: d29bd6ec20e30026f47aa0a0c82584294c43b6ddaf571dbf738eb23ebf92857a