Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c75bba91fcfd82…

MALICIOUS

PDF

111.3 KB Created: 2021-08-21 11:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b7947187c3ba1e75eff466d0ebb0395 SHA-1: 9b0c8b44c9e739b3baeeceabf0fa4c346d722377 SHA-256: 70c75bba91fcfd824a069d3a9b05ee4ac1783fe0b7b38c610405ad88a515e35e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 5

  • 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://nomylo.ru/uplcv?utm_term=defiant+keypad+deadbolt+change+code PDF link annotation
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/zepabedaramarofogomo.pdfIn PDF document text
    • http://attlas.center/userfiles/file/zejoveberikivowibosekod.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/xorugigedakaneririgani.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/petefagirulexu.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865868dbf2d---luvozokubivobexunevu.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/jafukado.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/91fd6c47894ac096fa713aa7287c963e/96430721054.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3e93795eacf8d738ae313be1559cbe79/sitibuworurop.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b214a953264---19539532406.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3fd62af251c47924773f93e0b2d76d47/wuvuwuxutixofenidibid.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/7ddad4a6dae25370c8bffbd076b8d1af/92031242100.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e6cbbffe4---55731742047.pdfIn PDF document text
    • http://praguetransfer.com/files/file/miradebaboselixogekumupa.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/zunemifemafitopev.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/gepezugataxew.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/93752641837.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/0ddfeb675322d1fb9a75d764bef9695e/64481812124.pdfIn PDF document text
    • http://peoplefineart.com/assets/202108/files/20210817002120996676.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/wubavemikabukazubeti.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5575fcf3---dikubijib.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/wapoleribi.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a881a94055---8049382505.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a340640471---wugotu.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/484365897006185eb6fefafc138299e3/37587514767.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/bavegujafapivexax.pdfIn PDF document text
    • https://tessuno.com/upload/files/60fb71491ba80.pdfIn PDF document text
    • 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_off00014a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A68 10976 bytes
SHA-256: dad075e63407c5eb3e576b68576c0f9f4f1492242ec107d2236ea00aa47b7ce1
font_01_sfnt_off00016366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16366 19632 bytes
SHA-256: 02cc4e920faf8eee156573566fabd5e9ece5812696c8336d2fef6f18a091b080
font_02_sfnt_off0001965f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1965F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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