Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa8438e81d0e353…

MALICIOUS

PDF

84.2 KB Created: 2021-07-01 15:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d6bda3430900709eb98503770bbbc36 SHA-1: f7e0e2865670f11e932b5d576b8b4a8c12b7e84b SHA-256: 7aa8438e81d0e353bec33c37b411b436973fc86d063c83708da0d1c93a21c9cf
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and compromised upload links indicates a pattern of directing users to potentially harmful external resources.

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 https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8atgh81ugri624fihnom5ppja1/17810423549.pdf
    • http://domainecomps.com/documents/files/31529198569.pdf
    • http://opusincertum.it/userfiles/files/dasilik.pdf
    • http://se-ty.ru/uploads/userfiles/file/60896930065.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872fa307025---63375744807.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qfvaj0sk0837a4gg0q0ib7q10a/jivinatovot.pdf
    • http://bpsstudio.hu/uploads/7565967913.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wusemimidagewuxumiza.pdf
    • http://archpiudue.com/userfiles/files/rizagovefofitejinudu.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/h8so2qvj6bhtek11tkso0r5ea1/46889073750.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59d2218cd2---faxaso.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/95053a54814daf7858266b52fdf11453/xazopunixik.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b09be2c92953a171dbcabd1ce290a7bc/81173964495.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b04efe00da7---37633141665.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/s011qkrt3dsfjk42hv8ujsgtsn/46348515977.pdf
    • http://lagostena.it/userfiles/files/27556741238.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/4aec321cdb5a0dad7d0c96e6980be5d2/88882370964.pdf
    • https://gadd-asso.org/userfiles/file/jobesoze.pdf
    • https://anfauglir.com/images/file/22330198884.pdf
    • https://101doctor.com/uploads/ckfiles/files/60b65f72912b6.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16078a6cdbced7---wetadefunosufuw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983bafc1dd4---lakojel.pdf
    • https://sanxuattrucauthangkinh.com/Images_upload/files/xedadadurodesuzejamipetaz.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b099b901d1---pesatozew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=which+metals+corrode
    • 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_off0000e934.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 16792 bytes
font_01_sfnt_off0001014b.bin
f2a229c7c9100a52eda3952ab46a7b3531dbef2da78d344dfb6143aa9508cfb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 10524 bytes
font_02_sfnt_off00011946.bin
445c33928b519520a0e302eebbcaba9884f81072d3b96fd326f1d7700e0998c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11946 16404 bytes