Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dba8ea7023aabc0…

MALICIOUS

PDF

86.5 KB Created: 2021-08-10 20:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 310bb890bdb0fe9fde3273ce00635a3c SHA-1: 5254854f6f2fd9ee1b1c90c40ae371bbf0df460c SHA-256: 8dba8ea7023aabc02a576a464cb14eef8bf16ad53cbe4f5e32dbd7f28533b9f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, with many URLs hosted on compromised WordPress sites or disposable domains. The presence of embedded URIs suggests the document is designed to redirect users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=what+is+fractionating+column+made+of PDF link annotation
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733d5a9295a---56439166479.pdfIn PDF document text
    • https://vleek.com/uploads/files/rivibuwejevumib.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/29333693642.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9f461db0f38e777699bd5252d191c639/xufisefamaf.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/93583376874.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b432b50a218---jasokadomopuwitedamete.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/82430710675.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/wafovipujoperenadal.pdfIn PDF document text
    • http://airfa.it/userfiles/file/47523459363.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/323c646418d9d272527387201c201fa5/semafiromeki.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/vebax.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/45597450917.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/70173141956.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606d118e9a7ef---migomunirevefa.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/gajlogvcsdvahslbnb8d5gg4j8/2281488950.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0cce92e46---2693165656.pdfIn PDF document text
    • https://tdfstore.it/file/papusezavumememu.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/fugidazawukeluruwurugig.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16102caba4138a---85020202514.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/keboxafabotukul.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/turuwuwoxabidaxitaxiwepu.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/tebekizikiwamok.pdfIn PDF document text
    • http://nineslash.com/user_file/file/36656849745.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_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 17360 bytes
SHA-256: 63db272bc9cea4fe7be346d04db66f47b3c43ebafd8190d1e392c9962f641b64
font_02_sfnt_off000132b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B6 11016 bytes
SHA-256: ba432d0f444f6c96f21131790aff660a83a261c0c63c2d72c40b1c600fc06acf

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