Malicious PDF — malware analysis report

Static analysis result for SHA-256 076953d00012c567…

MALICIOUS

PDF

82.1 KB Created: 2021-08-27 18:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e7ab9cec8988704eef7a4ea35460a6c0 SHA-1: 2d6d8f957fc7da8d624081d417957bdab3d7c754 SHA-256: 076953d00012c567b62f4229cef0386e513d6d35c8339e76733ad401f92d5f0a
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicates maliciousness, and the presence of external URIs and compromised CMS upload links supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ketchas.ru/uplcv?utm_term=best+video+editing+app+android+2020 PDF link annotation
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/408a39d8af3c17673d3812ddc4eb1371/65566985763.pdfIn PDF document text
    • http://wych123.com/upload/files/5469079170.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/g85rhnce08v19h32cbcfv0ejr5/narumexumetuwabuxoneri.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/7653351548.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/57908978074.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160df5f9cd98ec---82195414805.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b2878dc0a8debc67423aff127d91b000/wijuk.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/97799126349.pdfIn PDF document text
    • http://gysanya.com/upload/file/210818020701644203ucxiz6yr9gj1.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/94950191988.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/jazupi.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/mudanufakivinetunanotu.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/66714543750.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c730be06e87---sujavukuwulurorasiri.pdfIn PDF document text
    • http://rinsacars.com/files/others/nagugowodizutemoba.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/38941405984.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aac1ce2dbb1---tibozilazewitekapazave.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/10700749559.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a4441677f12---73734142222.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/zekuwed.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_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 17308 bytes
SHA-256: 2b94c94d11a50c9b68f344cc608ff4b625284ca5f7e7d1801e381f77a1ea9385
font_01_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12258 10880 bytes
SHA-256: 5946f72c4d83f1dad7000b499bc6a9ebc26f92d86e03ecd905a6edda39be318a