Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1030bdeecc10534…

MALICIOUS

PDF

65.0 KB Created: 2021-05-10 19:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38a9ad1b53023ba2aada9e7e0a5f52be SHA-1: f1b811f984bda21695b632aba341005c879efbff SHA-256: f1030bdeecc105341bddd516200db99ec65271237656bec9e2441007019bdb22
94 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress sites, suggesting an attempt to distribute malicious files. The document body's mention of 'Picsart pro apk 2018' indicates a lure to attract users searching for such content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

Heuristics 4

  • 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
  • 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://envomask.com/wp-content/plugins/super-forms/uploads/php/files/f3ab709f35878b131436146bcff3f57e/6330593916.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/661452a642338e56e1e8638cf652528e/vosatojebegudizuxavux.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608923760e372---wafef.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aa2b29c49.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1dce710d---37588701148.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091718c8f78e---73918376637.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c9a445867667ed799f7c950c1e5c2ddd/riwanajuw.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608907d881720---10885656438.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ff0d166caf37efe2db3d0ba3582a0fe6/79281091807.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/f558a6f10049f89f45a3efcc14b430e6/tarefubojelosalezote.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b22d9affa4---ropipisedofapaduzebatorom.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/13df8162e02e51137bef0db269dbb645/77626643933.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a961f4b33c---23918494497.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=picsart+pro+apk++2018
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d34b.bin
e83eab7fbe8c267fffa00f61f172b896eff5e8b533bb212834aa9a9fb784989a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 5480 bytes
font_01_sfnt_off0000e605.bin
aa86d79a0310f0cbfdd202797c4a289dfb544c468dbd9c233017db57c666c944		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 10940 bytes

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