Malicious PDF — malware analysis report

Static analysis result for SHA-256 5015c6eefd64855e…

MALICIOUS

PDF

84.2 KB Created: 2021-08-16 22:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 683978bafee2de4f675e4376d0974874 SHA-1: 2caa82343e50bbd2a2c4179d806a349f1792cb1b SHA-256: 5015c6eefd64855e9e9c9bb31f72ce5e60a680dd5890a4169b7f86fef8bd5793
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which appear to be part of a link farm hosted on compromised or disposable domains. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a shell, a common technique for executing malicious commands. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://synerhu.ru/uplcv?utm_term=how+to+bypass+icloud+activation+using+3utools
    • https://zegabilisim.com/calisma2/files/uploads/dedexogun.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7757b930a231f62e2ad80b658addf94/34584477122.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/taun1qkk76g87pk9hof694mpu4/40778697421.pdf
    • http://bkdesign.ee/userfiles/file/durorivobavowasofaziruda.pdf
    • http://businessnavigator.in/ckeditor/uploads/files/51658976531.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e89ee3a813a---17949092448.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826691e8745---60091840927.pdf
    • https://lee-trading.tw/archive/upload/files/dosuwojudutuzobunovosete.pdf
    • http://gtshotel.it/images/file/soviposubofitatede.pdf
    • http://doreenindiatours.com/userfiles/file/lorekugovibiri.pdf
    • https://www.thaiahpa.com/flash/files/28141093867.pdf
    • https://edcasys.com/ci/userfiles/files/72697958186.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/06e91df1057bf17025151d1fb4b26736/gasesiporexo.pdf
    • http://inbond-cn.com/userfiles/file/42424540913.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/ff52c31d09083a461aa3b2b3ed02f569/rijix.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/polupaj.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1epkbpipt5h3q6p7ugaunjgpmo/masojaduxudid.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/00262ae3e0e4c63a774357799c85e021/38197274300.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/2fh74oqohns8m4msu1p7nftqh3/jakagewotubusit.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d4bec26b---75184283181.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/bbd67bc44f50518838ad9266c4f69e13/warulelupijeteresiv.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/dk62dorv9d0acfa3t5noudphme/solupona.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/da20767d54ae45dbca9b543b6dd7b8e1/gixugemenunagabumepadajet.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae0fd6d16c---fulejunariluralubiwuti.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_off0000e599.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 16792 bytes
font_01_sfnt_off0000fdab.bin
b168b7a01409265d6d3e3b9d177cd30fedfe41958d3f83cc8cfd601a045f6da9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 16864 bytes
font_02_sfnt_off000129e0.bin
58444d63528461384e25acd1cbab703799facc464426171176393c2f4362da8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x129E0 11128 bytes