Malicious PDF — malware analysis report

Static analysis result for SHA-256 318b17b0ac0c0d80…

MALICIOUS

PDF

75.0 KB Created: 2021-09-04 11:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f1f30b41704de3560d7f45afd5ab49e SHA-1: 7e95a9f73e0fab5ce889a7126ff2399713850191 SHA-256: 318b17b0ac0c0d806003fca6a3c53b9e57a9d1ffd5c5c72354484ef7a34b4458
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of external and SEO-disposable link farms. No scripts were extracted, but the structure itself is indicative of a lure to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://drafthe.ru/uplcv?utm_term=comparative+and+superlative+esl+exercises+pdf PDF link annotation
    • http://dream-mebel.com/pic/file/fulemomililimas.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817c04b8caf---82872111171.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/25609675767.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/semipegom.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/giruwosad.pdfIn PDF document text
    • http://lyshiying.com/d/files/33160439916.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/lokesemiwe.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c47068492d7---32598673607.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160849a622d0ec---vanusevokepelijav.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc2b19d72c---90081875621.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/99428041995.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b61b894318b6657098eb6af86ad923cc/feduraxikel.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/96475405017.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b0b6d9eec---796959706.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609604cd516d4---49577225302.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fociiqmg360v7j16ufaqq62l1g/nusetubiratizikote.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8bb85669c---goxujetipudidixirijoz.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/sokifowos.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/86084037154.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ff31bb2ff---92887553263.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081480202c55---72956627299.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210904055251318.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_off0000c28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28F 16292 bytes
SHA-256: 4cfb751e925e7ffe6e0f7010064a39b469c24c9c49affb2829a02e4a49ce4e5c
font_01_sfnt_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 11080 bytes
SHA-256: 3ff0b0ca44b984380ee2a1ea3c5d27f6ba87bad1999d1bf825ee3b9b46b9fd55

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