Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a150d27befecfd…

MALICIOUS

PDF

71.3 KB Created: 2021-09-14 14:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: feb2d878be7e5b4b3780f9b89a313d7f SHA-1: 13c566931992747b2a4c04dae0022f01b49defd8 SHA-256: f5a150d27befecfdbdd7d6b087edc2b1041f66171dd722fd3d14aace73a70ad5
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 CMS upload directories or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a link farm suggests an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://galsabino.it/userfiles/files/76014671087.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139a531ac0d5---66901669690.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/mefawufafo.pdfIn PDF document text
    • https://digireg.ru/upload/84250056240.pdfIn PDF document text
    • http://195exim.com/datas/files/sokod.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/gifevutavuwefijafawojilo.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/zoderudori.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/17971596456.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/t86650v8paib42796cle3taumu/61405641691.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/66439537722.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/mugosa.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa0fae872---37391862495.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/74292887105.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/pewezu.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/lasisemigorufut.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/jiwugapifajivenef.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631002922.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/refow.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137abe788f76---jakepujovudawobirif.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/piwusot.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161316e0f58e30---38085741636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cricket+2019+game+download+for+androidPDF 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_off0000b68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68E 15348 bytes
SHA-256: 6a4aa9723a60e9899086f25fa47773cadea31a3965f4168d5d7e1909f9cc3392
font_01_sfnt_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 11324 bytes
SHA-256: 3d973453cfe4bd2d107964b53c8d55ccc4653ecad0703aa37f126e1705f4460d