Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d996a38667484d…

MALICIOUS

PDF

90.2 KB Created: 2021-07-13 21:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fda95ac31e2bca5fb81946446dddfe35 SHA-1: 90563a85dca3daab03dea97b548c627f3fc55a11 SHA-256: 57d996a38667484ddf52a5b230ce3553fefae66f6f5496b2bddcc832f9855999
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier also strongly indicated maliciousness. These findings suggest the document's primary purpose is to redirect users to potentially malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://appletechsolutions.com/userfiles/file/75746752451.pdf In PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f85e34cd2ba2078dca1f59757a12cb2f/jotisuralizejozadefil.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/939a379bc89bef415cff7894436312bf/vudigefi.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/26626dd6e0acb64020e5a61816ae3861/feliwakofeda.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160881a3c38b4a---lulubikisituxaj.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/jesefutupogufok.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/dc069l20kpd4roe6v5shkad5sg/zutovadurule.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160824cd5cfebd---48099688494.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/2036113609.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/99101438992.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/jekigenemad.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/76a1p2kb70121h7m5r48fvdopq/dowiwolulumapoj.pdfIn PDF document text
    • http://dzbnf.com/upload/file///sigekal.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/65690029314.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f4765de27c90390252577a7cc77e7210/45235938984.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/iej9mk7kcmctj9g2q5gdcfbo4l/segozevodixagevejezuwi.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/49c4faec218d4b84322233a504408656/42874089377.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160777f349000a---zulaxawanasudifijuk.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5eb2dcd2784d6cff6bb582e0020bc6a9/45255565901.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80edcef87---pifazibaxebobozu.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/wifek.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dfdecd83121---nulafilapuwopewumisofe.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16097b4e9db0f4---mosudonufitujekuxixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what%27s+better+roblox+or+minecraftPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/mudodivixelar.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_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 17460 bytes
SHA-256: 401818a56c5e02bc016b8e897be54b9a4a41f6daad679d61ef8191b4d89ce3ce
font_01_sfnt_off00012a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14238 10868 bytes
SHA-256: b68dd230942f28bf7ee2242b55e37d9fc030ff37675fa6302cbdd2b226f73dc9

Open this report in the interactive analyzer, or submit your own file for analysis.