Malicious PDF — malware analysis report

Static analysis result for SHA-256 3179d62981c91fb4…

MALICIOUS

PDF

69.1 KB Created: 2021-09-20 23:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d4511a58f840ba8824409acded8cf542 SHA-1: f2cb61572e07268a4dd1621aca0f525b527a7f10 SHA-256: 3179d62981c91fb4f64dbdb4f2dceaf8dd3126d7d8933e327e76a951413aa6f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing lures like 'free fortnite skin'. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lumieye.com/userData/ebizro_board/file/bizowugod.pdf In PDF document text
    • http://portalpr-b2b.es/img/user//file/_0903431001630795055.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/23773181060.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/vugejidetatir.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/livetilogil.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/lopenokevalisadobidaba.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/sonajuzebazevokazibek.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/judunatakufojolukolafugox.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/88976656684.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/pezuguvikat.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/jizulibimitibebesaxufujam.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/kixanozojezowelopuzozip.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/xozot.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/xiwevarufawat.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/petamozeguzarodegopefi.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/tuxolegokug.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/35a1e22e26192d8145d7dff0df636fa4/sovefivere.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161343a61aa43c---bozuzojabaw.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/tebadokenaxul.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/zarusitexebufomuvinalu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16146a5d690419---tegimusasezaxa.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/jixipowevisepuwisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=free+fortnite+skin+ps4PDF 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_off0000b26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26E 14868 bytes
SHA-256: 1c941e2b566b0112bb4d23e9fb55c8163677164a002c6b619e7ffb609a35e578
font_01_sfnt_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 10292 bytes
SHA-256: e9852eae3bccd1ad3f26b748eed74ebae62b21f4db4c1794338be1ff6ad76133
font_02_sfnt_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1