Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb83b661763bbed6…

MALICIOUS

PDF

90.0 KB Created: 2021-07-26 01:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 41544479d82bd7b7e41f780f8915abe8 SHA-1: e051b23ae727c18821d4a44777b301bde827d2af SHA-256: eb83b661763bbed674d9f8310cf98c6318d95fecb68a6f483477265db7b0f7cb
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest it's designed to lead users to potentially harmful content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://aquaprosmart.com/userfiles/files/wufegabizagako.pdf In PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700e51ee0d6---29904270983.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/29827651721.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/lukelibefufilijeki.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/3ktm4o5509mqte23m0jbeg1tst/sunemurisotuvar.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/92484995274.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/panokutukudoworaratal.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/20954853868.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/vetodonelemilakufaju.pdfIn PDF document text
    • http://leguido.net/files/xesokijotepuritonokobe.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/jenudapupetaxadap.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/pofakomewafosusogiduxezo.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/zabatok.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/l9b4h92m4adg4svgfcbk528ca7/89436021607.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/306ca0ba05b55f14fa3f27084bbbfd37/silojeliworuwinil.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/69857855556.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/xodoz.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/firorijatafinil.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0a183b60---48652078708.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/bc2ffbcce21c7fae24ed102c5845d6bc/26153011069.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/17133431435.pdfIn PDF document text
    • http://airfa.it/userfiles/file/sefobebudapexojinup.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0a18fa3b---magutikowelagujaloxopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+are+the+different+approaches+to+discourse+analysisPDF 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_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 17552 bytes
SHA-256: feb51ab17243f6d5ecaa5e32fdcce489eaecf699c27109275c11879bd47cd0ba
font_01_sfnt_off000127ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AD 10924 bytes
SHA-256: a95e7759af5775883bcc665b820e3ac87d8bb03917138c15e286b0999310232d
font_02_sfnt_off000140f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1