Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b6aaa9bd4d7e86…

MALICIOUS

PDF

91.7 KB Created: 2021-06-05 08:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 089358e5419ab8c5925fa419f4dd966e SHA-1: bfa238b159c96f2dcbb3d48dd6475c9e9dbbb3d7 SHA-256: 47b6aaa9bd4d7e86b3a602a606b5189f894988614017f6279122bfe4783089ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9997

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 https://ketchas.ru/uplcv?utm_term=risk+management+reference+books+pdf PDF link annotation
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a6ca5841---10991548830.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/pededovifo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qjp2e9bjgvs1ovm5kdbh21qig0/36060815376.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/majajesopore.pdfIn PDF document text
    • https://tipresentoio.it/images/file/63361838728.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/41ujuvnro0m7rng99e9kk3irg4/tufinepipilafiwasilezaje.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a26767e863d---peluporezeba.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/19eb65c9556e2ea68e5b11959bfed7fb/zosunaxoriwezefu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/56121090667.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160adf0e7bb81f---raxijupigenopetejafez.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/foxaxuxifuzuxazes.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/f9ad642c519da2dea05b101d07ed9673/soparipaxupiketak.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/fifirepuj.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6a17909d6---56329961295.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/sewubevujivuwejikumizubon.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41de5a0e3c---vomoluwafusizomuko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5D 5440 bytes
SHA-256: 83482192eceb766e16d1095a329995f793b5900a13f42f47e6adab4c0daa4964
font_01_sfnt_off00012cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB3 11352 bytes
SHA-256: cdc1c3bfcb0ff98dc6cf1d939c84a24d779f4d9db5e19e467f2bb5537e5541b0
font_02_sfnt_off0001532f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1532F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34