Malicious PDF — malware analysis report

Static analysis result for SHA-256 955eba0fc0a43a39…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 21:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd59cb36171ff86ae58162560e7bfda6 SHA-1: f414901955ecf46b66e151a4cf570560d81fe07c SHA-256: 955eba0fc0a43a396c66c7ee27be409bb4e82acbf383230d234813ab1c1c7d86
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or content-luring campaign. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=all+pokemon+in+crown+tundra PDF link annotation
    • https://serviceservice.eu/userfiles/file/98038609981.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/nutegivodu.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/84578701895.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/xeruvuvakevidowitozunes.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c5245290dc7---mepidafiguzeredesiwivador.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/tkaat7pej6ekkr17g36ht4972f/68613081559.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103149729d11---naridegerelixojasekigulo.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/45260896840.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/42688058719.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/9643568231.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/nitunizusowosopika.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/79848810889.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b668b20eb82299e5b060cb9fc641bf04/misaminavelojururamulufev.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a41bb1c1465ccaa731f74ea95d72ab9d/63387821779.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210510093428.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c15dcf61111---muluzaragulaborurotew.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/jitubupagumesatoda.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1kjhqdn0bh5s98ndnrmuacdmhn/pakukoren.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/defekak.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/876b652928279ed5ee0f7cac568b72ff/dagimotoba.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b930f0bb0d0---90228120959.pdfIn PDF document text
    • 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_off0000da9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9F 18164 bytes
SHA-256: 21359c05b98e0aa99e1991fe76e8503cf4320d2814aeed333d226bf6a7186b2c
font_01_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 10768 bytes
SHA-256: a715f3ca0b424ade590e3879fb7b7b1e4a26d7b2837bc642677baa76b74ddceb
font_02_sfnt_off00012294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1