Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc243b49b6bd87eb…

MALICIOUS

PDF

85.0 KB Created: 2021-09-05 10:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8e82c9d5a07f1aaf8de133db91c03d05 SHA-1: 57904c61355626f28b94f99ba84efbbf5bfcee14 SHA-256: cc243b49b6bd87eb400e393cb37d4b4ed260e4ff32c49a666e932a02dd1a64e3
104 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. It uses an urgency-based lure. 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 0.9985

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kimtuong.vn/isc/public/files/fckupload/file/5720702633.pdf In PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9eabb7690---tivujizalelubegopuxim.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/67317151590.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/13150567862.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa77adad9---29159783739.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/qc7fa9pfq7lbaei654so1igt06/lelopilaridaf.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/vutalidajomef.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/50703721199.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/gotojesa.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ef06e17d832f8a851a0504c1fb3c1d22/21007119785.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/45630310674.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/gutifumasixiluraritubu.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210614_185039.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0d2c83928---97000681201.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/aeae20ab04e43c83e5f58b113e768678/fatenazixexipikeburom.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762a59e3605---48874934086.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/vefakorawub.pdfIn PDF document text
    • https://schmitz.cz/res/file/taxoxabororigevuragupuzu.pdfIn PDF document text
    • https://promise-land.com/upload/file/detusiwusexuramovez.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af8e174d3e8---75899646680.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/10491944639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=convert+epub+to+pdf+for+macPDF 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_off0000e6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 17988 bytes
SHA-256: aca3293ed002aecb7379c21b42142325dadcb3c8fcbf24962086540a9a622d9d
font_02_sfnt_off00012deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEB 10812 bytes
SHA-256: 0f47f17539b6cf143537642103802d386bee47ae0c2eb6ae411543e209080cfc

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