Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9363f2202dc4e3…

MALICIOUS

PDF

78.3 KB Created: 2021-06-24 14:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 10ac181dd0a58284b2c76c32839af169 SHA-1: c56d08539a30b8cd8b3dd6eac1a38326929d4d8e SHA-256: aa9363f2202dc4e303180ba6d471156a74875d874adc8314ff625906ee24fda5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress uploads and other disposable hosting sites, likely for phishing or malware distribution. The embedded URLs and the document's structure suggest it is designed to exploit user trust by masquerading as a manual.

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://krisoc.ru/uplcv?utm_term=white+snow+boss+950+manual PDF link annotation
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c3d7cf624a64d92031ff9e24462cda4f/sovidolokizovetilejiwig.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cfbf183e7---94065811376.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/darozifeduxeludivesew.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77e948059d---6659585158.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081e2a61cebb---4342705620.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/biridak.pdfIn PDF document text
    • http://axwelindia.com/uploads/zifanow.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabf3ce8b1---gubusepekax.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0abb6c2d1---dufixaxef.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/2283781253.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070c378b2711---nijaropopawugavatenomoxud.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79817027d---82626101598.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/386b6fe47d4549d61e1e7a8cb501cd2a/kaxifukafuwekigaj.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b769cf955---ramibuvix.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/nodibomevonozovuxij.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_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 5496 bytes
SHA-256: ea6d45d2a8a747afff105c47b6c687f0887057fe7d3024119970dd8dac6a7c87
font_01_sfnt_off00010504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 12184 bytes
SHA-256: 5317b205959c46cf1b2fd9ad6a7c7d4345c012341d360fef35a16cdb74b8c4c5