Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa217f44cb14eeac…

MALICIOUS

PDF

86.6 KB Created: 2021-07-21 00:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9bdae5bf83c2fda4b0b44a6f1e9226c SHA-1: 1b25c7b1770c38a738943a13aac65f9a2772d41d SHA-256: aa217f44cb14eeac7a523b858d7a6540b498cfedcafe40e897376ffd8bb782ed
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised websites that host further PDF files. These linked PDFs are likely designed to lure users into downloading malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608feb5429d1d---42678448291.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e54f56164dc5869dfa7189007ac595c5/74697954305.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/jfj2q1unj4mrv2rk960ip0dj45/xipafiwuzajisijib.pdf
    • https://acryl-bg.com/userfiles/file/lirikumedomeri.pdf
    • http://novussiteyonetimi.com/uploads/file/wenirupot.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073f66fb922b---lored.pdf
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/35965158579.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080db9c56caf---26165190026.pdf
    • http://bolshunoff.ru/images/wysiwyg/file/82938919749.pdf
    • http://armanetti.com/images/meluzekaj.pdf
    • http://avgdesign.com/userfiles/file/48247621656.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/netovipavisiv.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/v71qfm2l4clpiqc111132fq9la/mijusosufetojalokatom.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/790857b1800a701b462fd6fdadbd417a/nuxalajejedefusupu.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/cbiclg9bpff13bbvoo4ijp04bq/xarekipakovurakifatudim.pdf
    • http://whatdwellswithin.com/file/videzukagefodo.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d0c178dbf397674b098a3fc741c13507/titutevez.pdf
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/5022519867.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608269ae6bdb7---biranogebuzobinelo.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3d2b471fc---jegidisokabafogutafo.pdf
    • http://kurier48.pl/files/userfiles/file/narimexidukasarijetavogu.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e26f1c2895b---numut.pdf
    • http://canxetaianhduc.com/images/file/99338516320.pdf
    • https://majorsagilekvaros.hu/uploads/file/fulesimazexilumaxufu.pdf
    • https://echipamente-scule.ro/userfiles/file/fonunopebiwijirogekawaz.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb572a24d5---deroxaporirizudupuparas.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=scripture+about+fellowship+with+other+believers
    • 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_off0000ef94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 16792 bytes
font_01_sfnt_off000107a6.bin
3e0f16a9312c5fc2a1e08fe940aa2a6de91069bdd79f348fd53833de1255cbb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 16940 bytes
font_02_sfnt_off0001338b.bin
1ba64b14017dc3df14f31f2f22064a09d3dade14b545071595427cdc4bc65cef
pdf-font-stream PDF embedded font (sfnt) at offset 0x1338B 10940 bytes