Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6acaca2a6628b12…

MALICIOUS

PDF

111.2 KB Created: 2021-08-27 00:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2acf97a8fd3836cd9309702d0f2614ba SHA-1: 43c308584b01d0dd75c1130e9d858df0ddab3076 SHA-256: b6acaca2a6628b12de21000a7af959511292da2a1e1d7bae680f0cb9fbf69ea4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The presence of embedded JavaScript and the link farm strongly indicate a malicious intent to exploit users or deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://heritagecambodiatravel.com/userfiles/file/15553772160.pdf In PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ecace12f575---relusumijuno.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611d82aab90c1---tiritutukopuvanofewite.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/121b785c49203d5fd33d0735168b6a1e/95497986331.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/14014389010.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/fexok.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/4738904015.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d036df0ea088c6547c87f5b54e39a08d/rokab.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/nuxisuledejoxibagegaxos.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/59127719501.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cuumd59n9mm9jvociu6d9ttss1/gemurufokeporifusaxesepi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f286ba2a505---vezizub.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2666947d4a792ee393f33c1f874118a5/sumalexasamogukajepid.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7384beb0a26f71dd2eb8014390d30abc/84635373882.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/635d71ea9175dae7d15acb8bf7543a35/97336135599.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acafb71044b---zadigunolozozopuzeg.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/97523177331.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160941504e5f46---12158448237.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/tetemid.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210616091839_gz9m0a.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/rubedabamufavitaba.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/gosigiwudorija.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b96f3114c1---vurafig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+did+margaret+thatcher+privatisePDF 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_off00014fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000167c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167C2 17324 bytes
SHA-256: d73e0746c6a287a0a2860a3aacf026bc26a528a0a4291e8bc39e540d92251761
font_02_sfnt_off000194a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194A7 10752 bytes
SHA-256: 73c75e47887cced8f66c62951a1c2b36706aa8dad42d3957476a407f39fd1759

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