Malicious PDF — malware analysis report

Static analysis result for SHA-256 b948e57df5963fdc…

MALICIOUS

PDF

87.1 KB Created: 2021-09-01 08:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d68fd0d7afeafcc804e5a362a79ea373 SHA-1: 110d9bceb6b52615982a91db7f7915e905235d25 SHA-256: b948e57df5963fdc2db4657b4f43d2aed1adf63c54267107ba0e35b3978df7be
196 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggests the document instructs the user to copy and paste content into a command-line interface, a common technique for executing malicious commands or downloading further payloads. Multiple URLs were extracted, some pointing to compromised CMS uploads, indicating a potential distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://rizecanreklam.com/images/file/34667345066.pdf In PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/muzin.pdfIn PDF document text
    • http://stattus.com/assets/file/24397842931.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/zigogetaw.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/sulipibivigevekomexux.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/61949029827.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210509183357595.pdfIn PDF document text
    • http://ccsl.asia/files/rewuvaz.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/6800433414.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841bdd91a82---93695650051.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f24a429c8bf---3831117957.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/66676625592.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/74652263192.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d545781850dd633a3356edf1fd5e0a84/rored.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210520050127197.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/neloforovim.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/3476272151.pdfIn PDF document text
    • http://rld-carbon.ru/file/japurumijepoxivekumowowa.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ec1c283cc6f978b859a715f7701a14fa/wabunepirolotupirazif.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202108250743589533.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/37879225951.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/vawesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=kung+fu+stylesPDF 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_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001085f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 10120 bytes
SHA-256: b136b909949f057bda372839e889fe8c7e9a4a84552c0fa7c3e607094a61a51a
font_02_sfnt_off00011f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F27 17920 bytes
SHA-256: 749dd3e43729c1317c89f97483d637c13952f14b43d4ad67348d9fd8d318a528

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