Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b1e63f1c2b391d…

MALICIOUS

PDF

85.7 KB Created: 2021-06-27 01:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 549aed45b4bb9a371850f4a1eb95d938 SHA-1: 8963bdf4c4a0e6cee11dade9a9866b651bc65386 SHA-256: b2b1e63f1c2b391d0eafff9d0f501050bb91abd939ab8143207ab98fdbf7bfba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The presence of embedded URLs and the structure suggest an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=how+to+accept+invites+on+minecraft
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b6e73e407---5607935765.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9aa0db90ab014be50dd71e3e5794a3ca/48287743570.pdf
    • http://www.aadhar-interior.com/userfiles/file/58823580869.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/oa60et894uu3vv1b9bf43uqb2r/40162703907.pdf
    • http://diamondsnspurs.com/clients/12200/File/34902881605.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b0534a92a---18199693436.pdf
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/guromapedarolorebubobo.pdf
    • https://benqmusicworkshop.com/fupload/file/supodisesi.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/svub77inp2oieb0t19a7qqvrtg/lumake.pdf
    • https://karinbentum.nl/uploads/file/mijoxunadijesamomi.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3189863f1a---mamapotuxonufireme.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/lanupiviwanujedinuziba.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c7c62e680---solikuvuwozobisonuzuz.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/94e66b7db151f9e62a86a7d801d6cb34/luseb.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a243beee677---68251854343.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/41ff9d78253afb2ce90b29c166beff99/kavidul.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160893390eb870---zarufivuseg.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a78b7da35---zawesirugap.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086499d07bc6---ragubamufojukeni.pdf
    • http://ajivikafinance.com/userfiles/file/nemogawigoverusu.pdf
    • http://www.celso.org/download/pejuvatososuwikegajuv.pdf
    • http://abogarestudio.com/userfiles/file/65775459931.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f98a8292---60649358034.pdf
    • 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_off0000ebfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 16792 bytes
font_01_sfnt_off00010415.bin
db0667036b98cb162ee6b9cb1bb2ac1bee8448ce4e91dbebe6faa3814ce70be6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 10736 bytes
font_02_sfnt_off00011cca.bin
a0e489c4f0d1b174fa683079107574447d57849cba600e338fede8f2c66d8b77
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCA 17116 bytes