Malicious PDF — malware analysis report

Static analysis result for SHA-256 b108532a57995dd6…

MALICIOUS

PDF

86.3 KB Created: 2021-09-13 21:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cac62668964f18684f4f0433ee903fe6 SHA-1: 6ae1d5829bad5aaf92dc8e3bd167c705f6d801e8 SHA-256: b108532a57995dd642367b3361805b9b49210cebd1437037ed1f385d8f6f0f99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://anipetkingdom.com/webroot/img/files/91165016410.pdf In PDF document text
    • http://acecaalcoy.com/userfiles/file/91455911174.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/xuturerubamaroro.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/murujugoworedefikot.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/jusutajulop.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/zovetalabarorokas.pdfIn PDF document text
    • https://amgaa.org/temp/files/69389414791.pdfIn PDF document text
    • http://reichspfarrer.sk/file/bakanefarefatunaw.pdfIn PDF document text
    • http://cabini.it/userfiles/files/pefanepobe.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/51755555479.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d56690ded0---jomananugazo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75b7b3e1b345f3d29e7e44196e391856/jubugore.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16305389203424.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/kebezupolubirimowum.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/fulekibikafakumuge.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/tutudewuzukuvex.pdfIn PDF document text
    • http://hanauhrova.cz/files/doxunasuvexukujumutob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d4520e32a---zorodilapamokopusanetexu.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/1880139617.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/40311429570.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/vetajumozijazef.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/jexezakaja.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/sodorilodamajexet.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/gavobatiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=best+android+transfer+appPDF 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_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10700 10500 bytes
SHA-256: 5d12857b1349f1e11ecd6e6e178f0b51ccfe4af8f536da0a8b6f7eab466865e3
font_02_sfnt_off00011f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F03 17180 bytes
SHA-256: e4a4c5521ba7489c01150a2bdf1476a8f644cc697d908d1e9fec3d5888aec899

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