Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee00c69c26b3aec…

MALICIOUS

PDF

71.1 KB Created: 2021-09-17 18:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ad08b5b6c2d0bd36f64a1a03412cf59 SHA-1: 0c5b3f37750b87cb5786abaaeb5e728300087f3d SHA-256: 3ee00c69c26b3aecd9201e82114d339a6e905576773720995e13963b4fd91faa
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://stellamaris.cz/userfiles/14248505564.pdf In PDF document text
    • http://piotrkowska77.pl/zdjeciafile/fubonoveleja.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/davawumuno.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/33977166507.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/3221343039.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/67088209799.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/90365202325.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/4de74178e5ce9317ab9e870fe2725369/rogaxuriwixirawebajapom.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/tatetikizogivudafonigin.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/78a3f0ed23d19012ba1f4241dd6b00bc/posonu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa16177d37---tepebefevukubupizividajop.pdfIn PDF document text
    • http://inphilong.com/upload/files/bolikojosikodimuwador.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/wuvula.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a7220679f---futamejafepewibare.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efac08b2bb---22290940725.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/vevikabatopotolavomirome.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/konip.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/wigoletigigarakagagesujuz.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47cb51958---15328516577.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0252146001631134434.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/43086500569.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135badf95c68---98754456750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=new+movies+2020+torrentPDF 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_off0000b537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB537 10432 bytes
SHA-256: 27d36099a6f32ebe58772819153648d3493dd05c934fa3551c3dcad32fe26fa8
font_01_sfnt_off0000ccf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF5 16944 bytes
SHA-256: b9f19bc64ed674b81322a93506c6e39dd2c9da8eaf388cfe1a14d0fa2876a988
font_02_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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