Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7251d1e9f842eea…

MALICIOUS

PDF

145.4 KB Created: 2021-09-06 01:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa2781380e4c224228d08bcf7e36f57d SHA-1: 77c41fb3a99a7541da5e1552b301dc81159a075b SHA-256: c7251d1e9f842eea904e4d6679ce766d850aa08d1a7e175cf67c089817f7a279
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to external sites via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://pistant.ru/uplcv?utm_term=lesbian+definition+pdf PDF link annotation
    • https://binarbaid.com/public_html/userfiles/file/vupulekexaperaduj.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/jorowekifededilaj.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/89ae93c5c943400906b2c5404794f631/gepimaso.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/vauobu03p23qdjrd4ubsli4urh/79558736684.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/23392952734.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/juvebifasaxi.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612100de3a464---dabosekodopuz.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c696234d94f---jozavuvafima.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/povajojaduxovigapu.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa5ce24fe6---widibumigebifumuzojosov.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8b528318c---85853838835.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c63f2f10f---83794724585.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/26750758995.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/79635231745.pdfIn PDF document text
    • http://fotossc.pl/_files/file/fenedagatojenevome.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/lanutu.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/0a6c11b7f2b62101966ee06b1c429d86/weseko.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/41872381946.pdfIn PDF document text
    • http://elitvorota.ru/f/file/bepulimavawatomof.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021728742465492.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f74769ed30f---71574914784.pdfIn PDF document text
    • http://reflita.lt/uploads/files/42731420674.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_off0001d51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D51A 10444 bytes
SHA-256: 00df5dee21d06e1fd9bffdfb038b0f051ed94c807d4836625f2af49ab2fd142f
font_01_sfnt_off0001ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECB4 19456 bytes
SHA-256: 9a19b7736af981660419d46fe63ff74a79c3fd5e23b192e6422443360276cfc6
font_02_sfnt_off00021fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21FDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1