Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbe4c427931cafe…

MALICIOUS

PDF

85.6 KB Created: 2021-07-02 16:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a8bd08a7f50de73c0f0e6c8339ad8790 SHA-1: e825b5b6f3392ac5852dc0b57bd7b80a9e1197d5 SHA-256: ccbe4c427931cafeb3570924a4939ffe58b2b706ffeb0a321d2d2907831049a7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm for SEO manipulation or to host malicious content. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the structure and URL patterns are indicative of a malicious PDF designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wastran.ru/uplcv?utm_term=the+coronary+arteries+branch+off+of+the PDF link annotation
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6e02eb6c33313aba8496bcc4e438fec0/89001592327.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/toxemedodebugibixezekefun.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/36924245316.pdfIn PDF document text
    • https://digireg.cn/upload/nezepazovuxivusexoruwefob.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dba861e613---vibixodarafekiniti.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b62c58f2---35894569839.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/44822615664.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6df85204---botexusotoriso.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609864314d14b---2580877249.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160af57b9a9fa7---40992492396.pdfIn PDF document text
    • http://minerva-collection.net/files/files/nilisim.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beed2f6c6b2---39976027848.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a1fdc64b8284b36efe8ad6bd02c3b9c7/30818428177.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/mabiwogamezewatoz.pdfIn PDF document text
    • http://podushka.by/files/files/tezutedawopamojulol.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16081de80911c1---60888164616.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2dc4b3a1e---vagapafikareterebe.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/bujabusakozas.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1605693ee622e47867540ff0edadbbd2/rejete.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608623c01ad70---dosogixobikujuvosur.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/zupobiru.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/35141453967.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_off0000eda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 10604 bytes
SHA-256: 97d89bcf7998b61a60dc8adc838505012b59f289989aadefedbbcdaca2aa1e95
font_02_sfnt_off00011df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF4 16660 bytes
SHA-256: e91eb8ec3ad069ff32ab088f36c19717b19a650113552ddcc06ac2ea0b586f1b

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