Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ccf5227a478aec…

MALICIOUS

PDF

81.7 KB Created: 2021-07-01 00:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bcf9817adddd8b0998aa632dd0c38e2 SHA-1: ae6f3ff4cc891a0b81d8e884d51bd0a25bb32371 SHA-256: f8ccf5227a478aec192ea829f1217e727c872e6c4a6c631c190fb9fb8e782d4b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics points to a tactic of redirecting users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://djennebeads.com/nbloom/fckuploads/file/rozasobif.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ui3sl4dhv3ljkvnf954qfl4re5/20330692556.pdf
    • https://clifestyle.net/uploades/userfiles/file/letafesobetile.pdf
    • http://bijverhoeven.nl/uploads/files/kugakiravurifomirel.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606dce2ea1a96---89733855099.pdf
    • http://nhuaduongnhapkhauaz.info/upload/files/1270403989.pdf
    • http://paradisoseminatrici.it/userfiles/files/74120571100.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073165d4f941---zupuxatokukusa.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c604598f1b1---wodowilip.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/92a782d92508f5c1118151904d85ca67/78708206464.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/ae55474055e915d3960873efcf03ca6b/61457947758.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/38684df4038726e26664a03961806f56/jokoduk.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/87fd96005c5e74bd3fff9921a480ef71/57288305695.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/92e3c008fb929a67c9032c419da2ca03/nojevubuxowoxewote.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3c6eda2c37747b9cbbada4b80dfd2b29/93785914772.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/1cb159394553a21476fe0fb6563be2cc/63272480382.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609625b5721c9---74366450792.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/fa345e7a2529ca082d9c657a15a9ddd7/jokixate.pdf
    • http://b-solutions.net/userfiles/file/sowuratugagoduvi.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/mk6ua1vjoposecd70hsdvk3s5p/velugoziniwuva.pdf
    • https://k-barrierfree.com/FileData/ckfinder/files/20210622_85F3E4A78CFE6FE5.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/1cc81d52ffabb638035c34277e484ae2/36731657531.pdf
    • https://marljivo.hr/userfiles/file/fivemamuveki.pdf
    • https://areicon.com/images/file/57579454923.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bf49c2bc4---49711938716.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=energy+conservation+quiz+questions+and+answers
    • 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_off0000da05.bin
a1919016ae1eb870efc32ca100f64789d8a8e9fece714a067b11f8318079a0e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 17672 bytes
font_01_sfnt_off000107a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 16792 bytes
font_02_sfnt_off00011fc0.bin
febaf2bb190c5d124b238dbbec1d57ed66648d8a89ac7891aa391ee88f3f499b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC0 11056 bytes