Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b22a3aabc4d4065…

MALICIOUS

PDF

107.9 KB Created: 2021-07-02 23:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ba4dfb67f4de6aa8421cf1c2a0fcf5d8 SHA-1: cad44a9051392f1e322f327df3e4daad44690917 SHA-256: 9b22a3aabc4d406547b6cddbb2fa2944471a7ef384c93b5e2824b027b3021c6a
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs suggests it's intended to lead users to malicious sites, likely for phishing or malware delivery. The file's structure and the heuristics suggest it's a common tactic for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=drill+sergeant+insults PDF link annotation
    • http://baobianhkhang.com/upload/files/46580497017.pdfIn PDF document text
    • http://hyderabadibiryanicorner.com/admin/images/file/68931358446.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082187fc4966---derini.pdfIn PDF document text
    • http://kfbi.ru/content/file/9027217141.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c3a318355---telagevebedirenonirol.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/fe09966d791cfb1e14bee186e9d7dee2/bebare.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acb5381f970---19829998783.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-22/20210522070424131497.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087070af2b38---sivetafimezuzefogon.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b79fd29d20a---digin.pdfIn PDF document text
    • http://artasedanasingaraja.com/uploadfck/file/janililimutolifevi.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a38baa75a4f39f7dd2ef222817c8bc82/dokudejubopezarasik.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210530155841.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88e7492fe1---junof.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086953bcaf9c---furijurinugelilofite.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/58352503499.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ea3f95b57811cb3a57dfc6efb5a87f03/22164303482.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/32301907334.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609244dd30770---fivizisurilizibezoteb.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16241363091709270965.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/kisalolikusa.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160725bf6e4fc6---vurutowinalaxigelozo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608246e499338---51381540020.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec2f16bb4e---88778885445.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_off00014554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14554 10264 bytes
SHA-256: 0d46611f7895c1bb9bc0f9d9c6d3bd46bd0a9cc434360ca291fd2dc6c7a7838a
font_01_sfnt_off00015c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C86 17556 bytes
SHA-256: cf5d83d1b0efe67b11a43d9430ea1991e88c85f5af17e8633724296b8ffdfba7
font_02_sfnt_off00018a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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