Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbc7c17cd016a0e…

MALICIOUS

PDF

67.8 KB Created: 2021-05-07 03:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17ac7a862745b84010e8a7aee7552d8f SHA-1: a6aa8f1ab24d2a6067624bf7dc336d773f1e0450 SHA-256: 8fbc7c17cd016a0ee36c9112fc51fb04e52a4e319eb5e3c9b39b4d780d723c63
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories. These links likely serve as a link farm to distribute other malicious files, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier also flagged this PDF as malicious, supporting the assessment of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8474

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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c07e8c7c86fc2612cc95dd24dbd9031a/xugebilegetebap.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b54409a4018d725374a15956989af914/jeranudunadigumabono.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16091b8031035d---jiwilimekofelawex.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f3eac4372e1d42a708bae5360f89e0e9/faromokabunusof.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3c448650---41570150326.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070d8fca62c0---gadowekupifubir.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1b478edb---57456875952.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faaa3c0079---39047731742.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071c9642e212---72694599183.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160775d7a480ca---vosuzewujutanivo.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/9esq98f2q6uab1225vmehgm7e0/24369129562.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160900985ea0d2---lebolilupokebuz.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/kvbfjigbpbrjap8mid094aaj5e/11444310211.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6a8b2dd93ec64632776b76fdb3a95b64/dasesazadagujufe.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/7fv3cqehvu3l4hhs73fj4t4fn5/giwita.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=breast+cancer+staging+guidelines+2018
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd42.bin
0dbbee329932078af8635eb066d81e84c8ae91e77b15ea656a20f6bd8b370f23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 5676 bytes
font_01_sfnt_off0000f0a0.bin
80542e8b45c7e2fd7106fb4b865888498c5f84c615d1333901c0194d100956e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 10120 bytes

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