Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4281ea81bf455b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 11:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d52cd0448aa5af6179e198028ae8e2d8 SHA-1: 6de37313fbeea2e4b0edc9f60ba010eb18267c64 SHA-256: 5c4281ea81bf455bbce77cd33d00cd618a5f1323be202f4ae4db78ca8bc13e9c
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8efc2cede6---rukozefezotu.pdf In PDF document text
    • http://dzbnf.com/upload/file///norupipunado.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/51591761160.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a4ca8811d---38057420349.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/28895291569.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/981980205.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946d5c8a284---dutavovilopejukivuvaxi.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/sozakosavo.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/26661395713.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffcef1df4c1---75190693826.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113f4750ddfa---jajerobuze.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adca988f412---ropoxuzasasumuje.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/vamudegum.pdfIn PDF document text
    • https://anfauglir.com/images/file/pegokaxizazatekadajofuve.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57ed2a169---22978070057.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609848578b90f---23510766555.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/1f360a5a8a6884e00c24552cb2073f1c/91809721033.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/af2ab74ff495aeda520ddddd9d8cb94b/nimajebefedogepezekejani.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/fagoduzugotutuli.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55134275308.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gagetofesox.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/d0ff04f40b610312fd11a4bedfddb64e/fekiluguguzudo.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094272341ec2---pifovaboxoguxuja.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/16717554293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=poe+weapon+dps+calcPDF 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_off0000e42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42F 17808 bytes
SHA-256: 89c5ea5fa9b42532c1820486d9ad278bd4e10d3032aa38379d94835b034baf8f
font_01_sfnt_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 10304 bytes
SHA-256: 94c3bc8fc337530c6c500ea530c34af733ba4a543014ef2e4637b97e8b6f737b
font_02_sfnt_off000129ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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