Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8e9b0bd02021a7…

MALICIOUS

PDF

86.6 KB Created: 2021-09-17 16:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f0b968e55674a7f84975d89e3a0e9347 SHA-1: 381239c2aa96aae4352fb51d29581f4299c33455 SHA-256: ea8e9b0bd02021a755c90cf78fbcef52193295006dfce3e5d12896afe2915588
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://elencostruzioni.it/userfiles/files/siligukumumibenemiw.pdf In PDF document text
    • http://elskup.pl/images/assets/file/12402166140.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fde41824fd---rejotoribexojegizunur.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/wamonep.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/pidafadosurijerokuxo.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/7315629745.pdfIn PDF document text
    • http://ha-sine.com/d/files/pitapunazogezixubi.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/xodivawegavixadagusudirit.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/997e1fda95de898312fa1174aadba071/wawumesokulibinudepujezi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb1133150---gawizewilanokejupavagoder.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/67524615506.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/96486476928.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/83786469759.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/2760693703.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/tulakerewasu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133959520f0c---75013139096.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/25681019434.pdfIn PDF document text
    • https://atiksigorta.com/files/fodotepivuwogetuwa.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/fefamiziriju.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14295029053.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/78021584440.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/kodinufavejidopider.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132264e957fe---49701702614.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ec87b922---norix.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/jasosali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=top+10+adventure+games+for+android+offlinePDF 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_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 21308 bytes
SHA-256: 01ee4c75ba56731dc84129383dad40354709e602e3a7e2492cf1f458318a1af6
font_01_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13289 11144 bytes
SHA-256: c762432b8132425a6ac59e5df359e67461790d6dab0b084ce4e0afe65139890a

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