Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ead0ccf7f454e94…

MALICIOUS

PDF

94.6 KB Created: 2021-09-05 02:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 626e6f3a1e6b015fcccacacb81b9a984 SHA-1: e9d92a9cd00baf54077e9823a123c938cd193977 SHA-256: 8ead0ccf7f454e9415f0027da302ee9b46cb5390f675f723892a0281780df105
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 https://medvor.ru/uplcv?utm_term=manusia+sebagai+khalifah+di+bumi+pdf PDF link annotation
    • https://homeuu.biz/upload/ckeditor/pages//files/xabaxerapizare.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/29499624.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c12a1e48be---dibarapobubixebad.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf0cdc94e---kipelo.pdfIn PDF document text
    • http://perksys.com/userfiles/file/99015578693.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/n91ktm113foardi9prg24h7pq4/36247909064.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cebcd9943f---zuzimenusivuresixugopis.pdfIn PDF document text
    • https://campermagazine.tv/public/file/xuwalirokoja.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/rejexukogixabutinapiw.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/52646809481.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/kurivuwimuwirovovok.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/63393496559.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/82626250042.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/34947008741.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8ee853042---fawopibe.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/0feb363204527a1426471316b396cc08/wefozixero.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/68b629a2108993f2800e17e3a4c26aab/75922219588.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607992d7ea835---vinax.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ac8194f16---60635015002.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/9a59755b7ff23ae8c5f77abdebbb57fb/tefuxijibizeminorajikolo.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e2c0abd9c---metepevowugigademubekisi.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/regugemozojob.pdfIn PDF document text
    • http://rhondachem.com/d/files/38282095928.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/74818948925.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010ffe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10FFE 27320 bytes
SHA-256: 90b12b2f309f4802058eb32186b00bbdd5320d2ebc75efd3e2bf8d11d4fedddc
font_00_sfnt_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 10952 bytes
SHA-256: a94df3bc04f48c810e8290c866876e856b493dce2ae3e8b5cfe889d13ba8fb61
font_01_sfnt_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14267 16252 bytes
SHA-256: 5067930e228fb3c27420111f0eaf2f47ed63c07a85cb8a609fb2f8f5afb37f53