Malicious PDF — malware analysis report

Static analysis result for SHA-256 a586631276fbcc8e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 05:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15eb68ee19ea91d1e7e2758cacf84e8b SHA-1: 6d79f57b8afcf4d3018a8e577665060268bfe315 SHA-256: a586631276fbcc8ed62073390d6a55623acff311d09d197b899e90df9684f467
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical detection for 'SE_SECRET_RECOVERY_LURE', indicating it attempts to solicit sensitive recovery information from the user. The presence of numerous external links, many pointing to potentially compromised CMS uploads or disposable hosting, suggests a phishing or scamming operation. While no scripts were directly extracted, the overall structure and heuristic firings strongly indicate a social engineering attack designed to steal credentials or recovery secrets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://ck-buhgalter.ru/userfiles/file/88993669064.pdf In PDF document text
    • http://malabarisproducoes.com/arquivos/files/6591856715.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/29299643772.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/wazekizusof.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/74947964097.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/gubib.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a17f64a5a---20641533850.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630871772.pdfIn PDF document text
    • https://partnermind.cz/images/files/8461636292.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/tulidipijajenobas.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/jibob.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613240ce179ea---detaserama.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/46514796084.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/pokiridikidakipi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f1b772ee8---xamiruvujudo.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/zopesoti.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/gozoz.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/89155233619.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/36969459636.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/14085424930.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/19550968041.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/bukikanafif.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134adc98ab69---bujipinatapepedigovovo.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/belefefedawag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+download+files+from+android+to+macPDF 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_off0000d9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AE 10712 bytes
SHA-256: bdb57086db2a929035e4e3e3c025adf4e3bd742ccdee2a1fb2a98aca4d3b2f28
font_01_sfnt_off0000f247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 17808 bytes
SHA-256: 4b97e7ab6c2b4e9cbc9691e09f32e93764ec5b64ee0ea1267d7b00719e6a5e9a
font_02_sfnt_off00011fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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