Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e6e1b16255fd7ec…

MALICIOUS

PDF

83.4 KB Created: 2021-06-29 13:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 357c5caea2e04c4a67f0e2170bda58c1 SHA-1: bf91a26e19e81871d23d1e5b8b946457dc71948d SHA-256: 0e6e1b16255fd7ecb14c36f9ee436f510ea617da4e414b57833c404c939e4821
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites, likely to lure users into phishing scams or malware downloads. The presence of multiple PDF link farm indicators and compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://madmojo.com/fckupload/file/28050522575.pdf In PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/60170224987.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/lavosumewerum.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6b535b169---1044538118.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073299e3270a---3993405346.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0b15670da3473373eea925b3b133fa01/9589009479.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096519d27233---lupigatulijiparuvunikinop.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/8k4la6ecj71o9np23r05chdk90/48298024910.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd25966cc68---41564502678.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/libobomim.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/fopezatosuxomavas.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-10/20210510002441203108.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082237607bc1---bijojaberumarosuvegi.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160997109084d2---37832893169.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/piginog.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160756a257e380---fefezujejig.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/bf5670d7c488aeeb68083599d3b30916/xubatovalutitujajexuxat.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aca2822646a---vobewitopumejefekepe.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5d02e367e---fokuxajogutu.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gisumadegodokazepu.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/69941652424.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9c455f6e5---80805815693.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bef81f0673a6ebc9cd8ecd6bc263e43/52111062863.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/89592993709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=atm+to+pascalsPDF 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_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 17184 bytes
SHA-256: a00f0a0e718377ace7f65e43b06def198d22d4cfca77f009a4a001b06742af1f
font_02_sfnt_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 10088 bytes
SHA-256: 2c0d2816b4279e5d618556e95ae5c17ae56bd76741e6a819cf8801b628f90874