Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7cadb861a73b93…

MALICIOUS

PDF

107.9 KB Created: 2021-09-01 16:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 07863978f6b37a912f83b9edcab870f9 SHA-1: f52e625be66c86ee78e066c2d9ffe28a616b71bf SHA-256: dc7cadb861a73b932c77b6974c0303d8b75874c280d9aa77657f1c67b68881f1
104 Risk Score

Malware Insights

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a malicious site, contributing to the overall attack pattern of distributing malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/gagoledexog.pdf In PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/6a3e3f3a4c87bcf058ef65240947faaa/90801819901.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128af4d02741---rusumosapujagunolome.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/ligadepevupifus.pdfIn PDF document text
    • https://apizf.org/public/file/38691281166.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/86249003173.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/ac811ba53a8b2a94f25a77f55dee4694/gubagewujukonumaxukud.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/mejafaverese.pdfIn PDF document text
    • http://araonline.hu/uploads/file/fuxegusajanujevuxegusom.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f196d34e58---17116181244.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610137a34d4f9---78335136114.pdfIn PDF document text
    • https://ijpdua.com/contents//files/43348059124.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948fb5eba3a---najiseviburivoxavutiv.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/mifasogulami.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/5587620936.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952a7f3c235---patojasijekoxoxikajokila.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/wivikipadebirivubujufufal.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/406d6511fcaf4ee6f12224cce0bc35b4/5221868561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gameloop+free+fire+new+updatePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10847 10716 bytes
SHA-256: 6a0e71edc52d9e8dbd38c47a81b6ecca58a45f239cc51a8235a04964ebe6347c
font_01_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F3 17240 bytes
SHA-256: bcf272871b7cf4db69c23dd5cc01ea8d3945ce44621c8779af13611e1d9ea9ee
font_03_sfnt_off00015291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15291 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_04_sfnt_off00015b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B44 27704 bytes
SHA-256: 2661348bd75a43d566619fc1ecdb41df501f06d1e41f7072ded479bd9eddf933

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