Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8347c756c1c5bf5…

MALICIOUS

PDF

69.9 KB Created: 2021-06-07 23:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 85ea5fc035e67c355e63b168d82f2d53 SHA-1: 0010d228769e5069d449c8140baaff27263b0e34 SHA-256: a8347c756c1c5bf5d3ebf959f4c01d3db3245095ca7d5a6c0b923b6988afcd19
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/uplcv?utm_term=firebase+authentication+with+phone+number+otp+in+android+studio+tutorial PDF link annotation
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/77e278b7b75e8ee4ff29d64539379cb1/bosapexufiroxasologo.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/76667284372.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704f1bbd192---xenovi.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/239dc53b6e9e06525094617ad51558b1/51881280437.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ol3dq9p9af7ckj8h2e82t5rkb4/41995286581.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ellt84bah6sg4ui2pqui8brhe5/31457356450.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80cbeec9e---pureguv.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/zafumobubenib.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/gusagajoderexujubur.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/14890773288.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/71858774866.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/deridepej.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/020ec9886b66f15e652e7affd175671e/tekesuwawibi.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/6bf7502c8bca1230d2bd4f3cc0c16341/vatubigoko.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609db07c935cb---dedunisixakalaro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DE 5500 bytes
SHA-256: 2773b6d2ae707386c220b67ab6c681d02aff51684b501e478dd1ca272d663c4b
font_01_sfnt_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 10120 bytes
SHA-256: c5d24c1ca1ab4fb7cec2e48537e61ef47f8fe0bbb8b20c3b76cfcc66eb002066