Malicious PDF — malware analysis report

Static analysis result for SHA-256 3155b6ddb456b986…

MALICIOUS

PDF

61.2 KB Created: 2021-06-25 04:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 075acee0c1b75285f737eab6858a8be1 SHA-1: cb0bfb423c3ab8c6bd34a831599832d6dfa353ca SHA-256: 3155b6ddb456b98636790a784e0953b2b2750bdd9ecd9063bc15a0a1e44f4fc8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links pointing to compromised WordPress sites, specifically leveraging the 'formcraft' plugin's file upload functionality to host further PDF files. This suggests a phishing or malware distribution campaign where users are tricked into downloading malicious content disguised as legitimate documents. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

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://smidgel.ru/uplcv?utm_term=astralpool+sena+manual
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dc12cb3d7---91590212720.pdf
    • http://mid-europe-ex.com/images/blog//file/48884363232.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607712b74adb1---wumusidapirifojofesazix.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2da46eeb522b0d07f4a865736bd3e23/nonalufusoto.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1744a0c0c---96637258726.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec67d69084---pazoxajibujekakudire.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c0f93f45b---zemopifelomejewatamepisej.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/8j4gr89lnusj9e2d3eafvusgd6/23742382439.pdf
    • http://zzweien.com/d/files/83911282256.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/cedfe3e09a3e88bd556d138be987f2ee/52733362133.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c7927d16d---27027167979.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160965d2e1bbab---nodevafubuwufasafor.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160763eb0d8a54---194521132.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/ce731458ea32071f54dfb9430f4c7074/11085715750.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/o0rhlgfvied7v3b72opomojpn7/nuwuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e191.bin
e562ddea6541de5ff088f34e0fc6e6cc7428ff4563d37e647262daa4cdec33fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 4956 bytes

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