Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e6f8f17c2774ae…

MALICIOUS

PDF

97.1 KB Created: 2021-09-08 02:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a1cdc849dd2b7bfa9e95a46ad4170fac SHA-1: a4eb2b7b697d7cbc2912fd2fa1fb10ec1aa7aca2 SHA-256: c4e6f8f17c2774ae73c72d3e25dc6f76fc2c6ca9dc6e32f6a3746b569f462662
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to various domains, many of which appear to be associated with compromised content management systems or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is designed as a link farm. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=veritas+prep+critical+reasoning+pdf PDF link annotation
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/zasadiledakelun.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/43bc817ade2aef7e63be96e6f1d04963/82062077716.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/82511389268.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9fb1cc4ffc201438a05c2aefe9675c7f/kilipore.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9b65e632c---towezokenepotilo.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/26223149181.pdfIn PDF document text
    • https://biocoils.com/img/file/85736553053.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70fe86e80b---gilotunukuwiduvoni.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953d68b59fd---vupadolulizarowun.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/41865361216.pdfIn PDF document text
    • http://tetedebois.it/admin/file/1134020807.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5b26816f1---maxuzabu.pdfIn PDF document text
    • http://519pf.com/userfiles/files/vaburigosipabavipex.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/16f7cfe7148637baa35da551edccdf6d/20352064404.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/74e627644fa08ddadfe304379bb4a648/63363978859.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/554e49f480397737150616d0ea1a9891/pajujinotazotibaweranovo.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/c1c1fsse0mr0j9nkh3j0b12hfu/69394901445.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/77285723052.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/moxefipo.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/89111361772.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/55346008469.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/8346241917.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/fesimuxaxenuxuzajo.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1d4e0b82bd2ceee6cbf269d59b7740a8/pevaxojo.pdfIn PDF document text
    • https://shibbirs.com/media/files/febewa.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_off000113db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DB 10764 bytes
SHA-256: 78abb96b26b6065a12a6af343899a1d53c8ef33d34a0d11a4bc85dbec70f6258
font_01_sfnt_off00012c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C85 19040 bytes
SHA-256: ee07c7a4e8dd3d1d404e00e5532e0669f52288a2c6d8bcf35d5307c693de743b
font_02_sfnt_off00015e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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