Malicious PDF — malware analysis report

Static analysis result for SHA-256 87faeaed9194133e…

MALICIOUS

PDF

78.1 KB Created: 2021-07-02 13:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c89be793720ad1e3f1a01a0d9e74a1d0 SHA-1: ad3eb03475aa2541f8a65725f35250dcd94185ad SHA-256: 87faeaed9194133e610442b6c38408654737fefcef85adf074a75e81185c1552
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially harmful external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098d148ebfe0---54391736395.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608129a71d2d8---vanibefovugefiboluz.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/454f39a214115b53388dea1ec3ca386b/54282081290.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160708c833d98d---dizakotefokimutofatafu.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5b848fa745fab0dd01038b428a858db3/46884360217.pdf
    • https://songhong-thudo.com/img/files/fewalazapodaji.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a757d3781ba---wekipafaredev.pdf
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210616_C344C9513349E30F.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/u5djfqvsvgi0tv60nds1ad08e7/22802332772.pdf
    • https://ienter.bg/files/sosovususamojokizip.pdf
    • http://vinhthuan.asia/upload/files/lobamifupewi.pdf
    • https://secolink.sk/userfiles/file/87572664315.pdf
    • https://coil.hk/upload/files/wiwoj.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072847f96d26---mubopemusudejugofodana.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/c8737bf6d99f4dcec4bc0e2f99faae06/9958106991.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eae6a920a0---64555045452.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/f18302617b272f8508d1b7c1958260f8/419588194.pdf
    • http://gianphoiduyloimodel.com/Images_upload/files/vofasoz.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/75cab5820d005a4831d1758739c7dfc9/notevapexudefawibubaxo.pdf
    • https://soechi.net/userfiles/file/jefinodageluvelirevalusuk.pdf
    • https://amd-export.com/site/upload/file/neradapozoposudone.pdf
    • http://arablift.net/userfiles/file/40127996677.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ee707a8cd4069cb35b4e693b9077ed84/memiferigamobatalawebu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+mixed+up+chameleon+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf22.bin
76e10768ce7aba99565a76fba7c90b4627f99f7e02ef3fb23fdd2e7253d416b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF22 16788 bytes
font_01_sfnt_off0000fb2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 16792 bytes
font_02_sfnt_off00011345.bin
0edb20ee4ec842e02589040442aa193e3ab2c2a2fec33b26b9d9d9dbc1fb8981
pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 10684 bytes