Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bcf44389108c66…

MALICIOUS

PDF

83.9 KB Created: 2021-10-05 12:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 784b8d9563487d87a88340508936f399 SHA-1: fc9637dd7f6d46a2a9e711869de72b6c70ab7cf4 SHA-256: 35bcf44389108c66dab27ae77fa612dc9ba4cf0320a707f4021f64fdf1688cbb
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be disposable or associated with compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=gut+renovation+cost
    • http://mjacz.cz/soubory/files/23361493281.pdf
    • https://maydangson.com/vietkiendo/upload/file/2320484472.pdf
    • http://clarksville.net/wysiwygfiles/file/42330661977.pdf
    • http://pc75.net/upfiles/file/1630495250.pdf
    • http://nb-magnet.com/upload/files/84289447472.pdf
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/4292510038.pdf
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/bifepujiwazamopejidunode.pdf
    • http://fishngrill.iorderfoods.com/uploads/files/34737846782.pdf
    • https://mkart.it/uploads/file/sajekunasine.pdf
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/sezolawomaruwev.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d657f23950289ced41446015d52934fa/55562514741.pdf
    • https://cheesykeju.com/contents/files/88906948961.pdf
    • http://ya-ke.cn/admin/upload/50284012954.pdf
    • https://suzukihungyen.net/data/dulieu/files/48947012551.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc23965245---pewuvoj.pdf
    • http://wienbildarchiv.com/upload_files/files/2300974375.pdf
    • https://3rproject.eu/ckfinder/userfiles/files/86162443331.pdf
    • http://abpjseah.news-read.com/upload/files/welokino.pdf
    • https://rlmahtani.com/userfiles/files/92251739549.pdf
    • http://analhospital.net/file/files/pizan.pdf
    • http://ekmeta.lt/failai/file/mutivifoxejar.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/u4ldrh53n67r897h435l97hsmp/jalokagi.pdf
    • http://banghetretruc.com/media/ftp/file/6951803629.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naxovugatulu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB0 16792 bytes
font_01_sfnt_off0000f5c7.bin
c9ea9b46b201a869ab5586a3278ad18e7273464c969ef161b62e2229cb59f661		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 10384 bytes
font_02_sfnt_off00010d73.bin
cc7d158881ba134212a43c4a6b36106f89edf87e116734cef8aa946786b4dabc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D73 20356 bytes

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