Malicious PDF — malware analysis report

Static analysis result for SHA-256 41516573815ecd80…

MALICIOUS

PDF

84.4 KB Created: 2021-08-13 06:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 327566d616c9b21efed1edbd51fec12f SHA-1: d1dc9359d90e43f2660543338a5b969385b5497d SHA-256: 41516573815ecd8064fcd5cdad9a96b906fea638368dbea2653e86a3fa72de51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these link farms and compromised uploads indicates an attempt to obscure the final malicious destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://agrilaui.com/userfiles/file/70829183650.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608213e744f63---lirezeze.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i3m509j0063rqlrpfa3aqofpim/joduforunanakiburobepegup.pdfIn PDF document text
    • http://dalaichau.com/files/47118586787.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/6f35b74fa4e50ae62ff30285ea86fd00/34003666700.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/widorarusizalabe.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/63314546474.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/b956fa05a87510986ce723b86f18a610/gufegagatutirudirulexu.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/tabotubak.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/65552989907.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae73e7b4fd---5930630274.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/vatikozovuj.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/4e3daf593aa29a87cad67d65c271d28a/notabi.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/94840583651.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/82651006270.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0aa123a00d22ba965073e7aad54f33d1/38220138731.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2c8e120c9---10385371377.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/78638877425.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/zonugexefexev.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160705ddc52382---20363595752.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92f26ee46---54139348868.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095c7c57c697---valunuzowiw.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/74321438182.pdfIn PDF document text
    • http://goref.ru/files/file/zetosufivokokofun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=random+dragon+ball+z+character+generatorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 18116 bytes
SHA-256: f915d641cd50f1286c28cac5c922d31528577975ccb702e34885a0a23d395b56
font_02_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 10800 bytes
SHA-256: 49c81edcf49c4c1a6a1fe281b5ebd0fc3a2e68dc404a9b84ff513880a031bdd0
font_03_sfnt_off00011864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11864 16640 bytes
SHA-256: 576ce328e8db74429e66d138668ef8108b24468da20f4e96f74ab3db40af31a6

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