Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75b4471570ae67b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 00:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b89f79fa6ddf1b72d20ccfd63550260a SHA-1: e985f7c6e033743b6d648582472c6f82f975da5a SHA-256: c75b4471570ae67bdac382cdc5cc3b29385826578fffc1f03d8c91545829fe54
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. While no scripts were extracted, the primary attack pattern involves luring users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608631675222b---putubaramubavogivudefalud.pdf In PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/9392154592.pdfIn PDF document text
    • http://hexindechem.com/upload/files/wurefidumisuselifipor.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607217a05d833---73060492298.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/lodolibabamupezapuweze.pdfIn PDF document text
    • http://altinellerinsaat.net/UserFiles/file/vabaralulun.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/55280714098.pdfIn PDF document text
    • http://chromoink.com/updates/file/21365111165.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/dedewejad.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160848c5cd64ce---25554773813.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/10670866269.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/62426840846.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/jolaxosugafotojovew.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/77d7b0733fb8802c2a4cd335e9cf5934/getit.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed3a8497f7---17779058162.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/76077740479.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/43957052437.pdfIn PDF document text
    • https://kham.vn/userfiles/file/98302550190.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/42441604004.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094660c2229f---sekunakogifafikopezalo.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/supof.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/44e46fb36d59b0d05529210500caaa87/xusedoxinujaxo.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/069b6528968cf5df4070da62cf962711/55358461816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pound+to+madPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 19800 bytes
SHA-256: 91f5adc096dcecc0d4ff29ef28fa7375e537af138ea2ff4fc34b8d36d9b4519d
font_02_sfnt_off0001257d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257D 9972 bytes
SHA-256: 290cb66227dba61bdd96f140204070245b9cd5bae9ab7e087fafefd068b26d12

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