Malicious PDF — malware analysis report

Static analysis result for SHA-256 0696ac4e2c3ec0b1…

MALICIOUS

PDF

89.0 KB Created: 2021-08-15 04:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f90a46dc61e19c14dfb5c89f917a5ab0 SHA-1: 09ef31b610f4fc2a77ccf520fa43ed0f110d4ed1 SHA-256: 0696ac4e2c3ec0b16266aacd4e630b42efa5d76902e0e84991f0a66b4db0abc2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier. The heuristics indicate it is a link farm PDF, with several URLs pointing to compromised CMS uploads. Crucially, a 'Clipboard command execution lure' heuristic fired, suggesting the document instructs the user to copy and paste content into a shell, a common technique for executing malicious commands. The presence of multiple URLs, some on potentially compromised sites, further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5fvclvor0s492n1cqrkrignkp5/xixun.pdf In PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/18422088550.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cfaa72ab66b---730275862.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/11b9b9ea71553ea4d07a682a789c6586/xosekapad.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/jufabonenev.pdfIn PDF document text
    • http://jcpingie.be/public/files/21949619613.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/daxegipitovababibomupuja.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/egviagq632ljnrutpul9bkonn7/difanimamijubini.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/guniwodipimobukizepepezu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c239272eefa---25275432924.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/lazifevisi.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/86927210113.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa0fcdad76---93767411838.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/firexulexonojotiladuzegi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9cd5519b6---90436996069.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2df4eb240---wasimamamomotak.pdfIn PDF document text
    • http://markone-tools.com/upload/files/jurugolimigu.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/zigap.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f2292fd6c---16345866924.pdfIn PDF document text
    • https://isosklo.cz./uploads/48980892113.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611217b5eed31---niwuk.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/sagifukuvivonafi.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/xamonizipobakik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=beautiful+cursive+fonts+generator+copy+and+pastePDF 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_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 11128 bytes
SHA-256: daecf9e8e16ae8b9f764c4c1102e17e1dc012ccd30155a5108c30a3963e0bd0f
font_01_sfnt_off00010f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 18064 bytes
SHA-256: 109ec323dfa1c3ae1dcf80d5abae8e243ac6a03cb9f225a1a6bd67142b930c72

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