Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5aacf89b084628…

MALICIOUS

PDF

83.7 KB Created: 2021-08-26 14:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f2b6553d272a4c595ceaada36a427c29 SHA-1: c7fcd6b350634cf7141cbc180413153fad334b13 SHA-256: 5f5aacf89b084628b359c9fa9c7ce0b1d429f0f0aafb0ce37b4c2f8fd222360a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://electrogalicia.com/electrogalicia/recursos/archivos/68336089799.pdf In PDF document text
    • http://studio-orlandini.com/userfiles/files/55617532193.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a647ab46040---30489198680.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e12389d386---51986314737.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/65099579176.pdfIn PDF document text
    • http://unsersohn.ch/images/file/57300533213.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/38178966257.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/435bcee70431253e6393eefc656dc1d7/wusuvojititibagizunesi.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a30c167e30---zuboxepibalopezagum.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/4348738345.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021062621572380554.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/53744088597.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/19276359803.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/83801633044.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/sumifuzobuvewi.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ub8aul249doatgsg25ttf8afe8/43500576536.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/40941543875.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac72e0ed21c---vukubuzujigifov.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/zojifadosevozewon.pdfIn PDF document text
    • https://istanajp2.com/contents//files/zurazakapakuwulaguxogeb.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160772e52b9377---83172422019.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/b946d51d9820bc08e570f040f96f547b/75242295970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=clover+mites+in+bedPDF 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_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 16640 bytes
SHA-256: 1708bf91842018ca3ab3ee6e8c200338e3ce0fab46556d5cae7eee19176bc346
font_02_sfnt_off000128e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E0 10484 bytes
SHA-256: 50ce5bdf836ff2fd2489efee2ea72645cc1f64101b826bf7be38ee78f01036a5

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