Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace31e0d7e02fef9…

MALICIOUS

PDF

73.2 KB Created: 2021-08-05 19:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f513a194f18e9e73fb942c4d73cfed9c SHA-1: acf8200033435fbff3846a056abba09d357af28b SHA-256: ace31e0d7e02fef9faf16943cb3251994103f9dedd78c2670b7af66a35097bb6
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. This suggests the document is part of a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://anatolianlgs.com/userfiles/file/vidiruvevofe.pdf In PDF document text
    • http://closehorses.com/userfiles/file/jenazaxarotadar.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/fezoputokexowa.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad91df3fd0---giwomoxegi.pdfIn PDF document text
    • https://bem-sa.com/img/file/21950809430.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb0b3eba7---soreliwolil.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/peval.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/95672595124.pdfIn PDF document text
    • https://digireg.gr/upload/17052579889.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc76b20ca9---navinat.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/98374670545.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/refu3l3d1mta4fscbellreu45j/66894371196.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/tagofiruxuf.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/setem.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/1156092567.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/pupurasedoboriwivawopef.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/vawolitenagapudibofawezix.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/76599480582.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/33107701561.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/zomenawatikuw.pdfIn PDF document text
    • http://93564497.com/userfiles/54293203737.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/kadeg.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a811b369b5e23c48e0c4300ff2be10bc/zamarinelowexavesejuvun.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f72cae22---41609464099.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/gabodunevusiwejuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=como+cambiar+de+pulgadas+a+milimetros+en+mastercamPDF 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_off0000c0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 11128 bytes
SHA-256: d4b3863db596f012b18feb5b8c37db200a0d4486f7e3cd0444548683681fe779
font_02_sfnt_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 14392 bytes
SHA-256: c52562eaa9564c1cbd2f8b6249f9f381a78fd2d2d8f91b862fae3c0a86e87fd5

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