Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a6725f706114a4…

MALICIOUS

PDF

100.9 KB Created: 2021-08-10 12:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48e876ebf82a49d09731fc0f492628ba SHA-1: bc2c1c88495d07023ddba502afcbd385cc727104 SHA-256: c1a6725f706114a439895e221fbafb52118cb8aa22de2544e51c6a56395d7bbd
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to lure users to external sites. No scripts were extracted, but the primary attack pattern involves directing users to potentially malicious content via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083727982026---bonipavavi.pdf In PDF document text
    • http://martom24.pl/martom/userfiles/file/kalasetut.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e52b430cc3---51113291133.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072e4545fc45---37754003089.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/51020658364.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160916a0403187---85902738971.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/42d34a6bcd329501511194e1767a6f93/89905759674.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/nomopikebajom.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ca17b3c5---90128272272.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe1ae1fbb---batirumazexoliz.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1921b4e0097a3884a62c4d493e54df97/25869965211.pdfIn PDF document text
    • http://vhktn.at/images/content/files/13893464683.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b632378a6ee644c805b9f3897094ad4e/9161900647.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/xamowap.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/zitawus.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f0a6f840---51565634577.pdfIn PDF document text
    • https://cubic.is/userfiles/file/wofek.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/junaravipixatejepokotev.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/58313512567.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/bejudojum.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bc3dbf85f---62047197761.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/zivag.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/8b387fbc492eda9435e58ae5e53f6c58/vusovelavunedefumodojis.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/88262281709.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/46364346038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=articulos+definidos+en+singular+worksheet+answersPDF 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_off00011ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13807 19544 bytes
SHA-256: ac8065fd2c9c3e41a6472eaebf146946ed68460a1ff4dc6731820a3f5a908a35
font_02_sfnt_off0001691b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1691B 11016 bytes
SHA-256: eb3ed8a06bddd27e0255a16399c38b2700e73042c5026ca45939cb2ff00344d8