Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacababccc00dfc4…

MALICIOUS

PDF

73.3 KB Created: 2021-09-17 01:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2bc34af132837206d3a4c8d0203d7a2d SHA-1: 92aa41940d2b882aeb7c06e78785d95254b3487f SHA-256: aacababccc00dfc4d6078a2abea8395450625579f9a0caeb25e4d37957cd2bef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL analysis point towards a phishing or redirection scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf0a270c9---devareku.pdf In PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/evm18r874hlbmh5892oqj06jr4/54955428393.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/puzik.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/55340333535.pdfIn PDF document text
    • https://x-software.cz/data/file/bozanadavavu.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/dedilujorewipiriwosako.pdfIn PDF document text
    • http://ombs.ru/uploads/files/lubufozotizel.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/31616629201.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/tunagolexutasomemi.pdfIn PDF document text
    • http://chinalabware.es/d/files/fanugipipikakanuwor.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/47178842401.pdfIn PDF document text
    • http://e-sheremet.com/img/mugexomumidavobomuradij.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/wopemowaw.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/18f93dad593899bed546078c7d0cfef0/gewojuvoxubeke.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/bafis.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/phrde5i7projjggd9vjlq9htg3/36930771526.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9888c257b---piwimow.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/fudazipumogufenuwimunalo.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/76625550529.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/58254eeee94f8877c5349b25cb6a4160/886902878.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/dafusakugomuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=undertale+papyrus+fight+simulatorPDF 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_off0000bc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC21 16084 bytes
SHA-256: bed2e767ca52011842364561ebe245792eca367e343b4d63ea95a2e87f0f7cf2
font_01_sfnt_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 11168 bytes
SHA-256: 42986fa38fe6a4bc5400155270def905080d6b87def9af4e68f034847038f79c
font_02_sfnt_off0000ff51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1