Malicious PDF — malware analysis report

Static analysis result for SHA-256 548ae9fefb268ab5…

MALICIOUS

PDF

93.7 KB Created: 2021-08-03 02:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 88feec4f2c6615e9408f6c48a4c85b49 SHA-1: c19f6b05b6639418592d9e013f236e9d303c34de SHA-256: 548ae9fefb268ab52e09b567bb07711f2359adfc5e46dfd524d26c08d4b29af0
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations. The ML classifier strongly indicated maliciousness. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to lure users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://ajitcoatings.com/uploads/49613700489.pdf In PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/fadegakuvipovom.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210618080147.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160756eeca9194---tifiboma.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/34079610346.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16079f844f4123---lumibexaxikowukisuta.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c606c535b94---90711140146.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/08039520c308c8e440cd1a0100249975/dokifipipetekagu.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/5619722ea0bd67aaaa25459f57c41d77/vivakoxeweg.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/p0rdamoc4f49146cpdm1qae974/zirilogaxatofo.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/45241810742.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dde869a7---pemodovuwimapamipu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cd5eeb3ef---zupixodipedonugonajut.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b2d14ec57---79150026347.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc5fc33234---lodeb.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec720c2d57---pitixabimuxikizokejabuva.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16080c4279d587---mopodixemabevifi.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/66436245824.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab6d6544e4---30906147783.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a5dc02fe1---tanonunebalar.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/21004962380.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/54976128840.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/nudopiwegamobawenufonab.pdfIn PDF document text
    • http://nessium.net/userfiles/file/35251119737.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b3e40234---716663281.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/26481715989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=guia+de+estudio+para+ingreso+a+nivel+superior+ipnPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_01_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 18460 bytes
SHA-256: e56ef113224476a24c6b46912e8bb44fef4c738ca6760ee145c616a59f7efd50
font_02_sfnt_off000138fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15113 10772 bytes
SHA-256: e4549cb2766b10a881cda0aed5e2ecc3fbb7b5ff36a02a1377e8bdf1e2485543