Malicious PDF — malware analysis report

Static analysis result for SHA-256 6795c17e0a424cb0…

MALICIOUS

PDF

87.1 KB Created: 2021-06-28 20:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e0f101188f0deb4392539d639cf2f89c SHA-1: 6b83dd95611123a475cde6113f0c720550117324 SHA-256: 6795c17e0a424cb0068d2a1edbab5d77fb122cf116efd37d2a23b4e31cc4804f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and utilize disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users. While no scripts were extracted, the overall pattern of hosting potentially malicious content on compromised sites is a common tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba2616c9a---fipiwiwotelebimilawaja.pdf In PDF document text
    • https://aduanaldelvalle.com/userfiles/file/33710594668.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/48193865586.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070bec2bf174---22871186903.pdfIn PDF document text
    • https://telenovella-bg.com/files/lipuxexodugis.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a628ba9d---mizenod.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/74444590580.pdfIn PDF document text
    • http://industrialdevices.in/uploads/javuvepobunusudulel.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/39862775912.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6bd7369e---romewetafoteludexotofun.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af97b3b2f33---88863457192.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/87588647615.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abe73f1b21f---91984124828.pdfIn PDF document text
    • https://afayl.com/userfiles/file/vojivajumalen.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/87547709662.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/81339632.pdfIn PDF document text
    • http://dzbnf.com/upload/file///powuzizol.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/80491101337.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/93980380210.pdfIn PDF document text
    • http://babamoleskine.com/files/file/87186629063.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea10f6b90d---nuzudunutawi.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d90ce1d8d---44955149115.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/jurosoxiberavove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=coy+dogs+picturesPDF 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_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 10620 bytes
SHA-256: 2ac2b8955f4cf48097b31160ab9a6af5b2e8e889ae6d47fc8510c073685adff5
font_01_sfnt_off00010afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 17520 bytes
SHA-256: 55bf3b7f00e379501cd5220228ff529b5986e48d1b9c9e3cda9f013704569409
font_02_sfnt_off0001387d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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