Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09c49e3a3dca9e7…

MALICIOUS

PDF

86.7 KB Created: 2021-09-12 19:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f647d87e0f7745eae3b43055e0dbfe45 SHA-1: f4e3ed77f4a7898792e47b298aa3d41c7df3ef35 SHA-256: b09c49e3a3dca9e796b000d6c9d27bb31c205fc18fb17f518d78068604b35111
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains numerous embedded URLs. Several heuristics indicate that this PDF acts as a link farm, with many links pointing to compromised WordPress upload storage and disposable hosting. The primary purpose appears to be redirecting users to external sites, potentially for SEO manipulation or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pokemom2.com/uploads/files/zagude.pdf In PDF document text
    • http://mediedil.eu/userfiles/files/gojivejegi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136349dd5c2f---xujadufilesekozogavi.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/ripixukuloriteme.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/73d6a1b84864f30022604c400ece8ab3/10752809282.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/56666738594.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/xudojuvezefasigatazimoluf.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/13830058962.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/25869923377.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd8050af78---62184666223.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/nizokozig.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/32329333908.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/wegemevunuvodonibid.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210911004548.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/lerabevujasikun.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/kuwirefujatalir.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138cd11f2ef3---82565965310.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/pakulosusuzesiged.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/38939429072.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/vatunatakupagesi.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210906043247410.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/fiworemiwotano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=shaadi+mein+zaroor+aana+full+movie+part+1PDF 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_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 10948 bytes
SHA-256: 5456664906a5d4a5e0a0a07af67150f1ac95a57e1f9751425e792842425443dc
font_01_sfnt_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 18944 bytes
SHA-256: f140f4afede086e0f51bf38cb5463bbfea77d4e3d2081fe060b5a96f96be17d0
font_02_sfnt_off0001349a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1