Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a5d6557569e209…

MALICIOUS

PDF

82.1 KB Created: 2021-08-08 00:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52d54c8c6f039987d7febb0998392a9d SHA-1: 00b866c05351f278a679ddef198c71a612fa0be9 SHA-256: 88a5d6557569e20952f7ed467727ad434c94a1a996dd9a9412267cd5a150fab9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites, often associated with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=condensation+evaporation+melting+freezing+worksheets PDF link annotation
    • http://nb-magnet.com/upload/files/26316788050.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbbe24579b9---samoreneraroluzisapi.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/68065498353.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/7353685045.pdfIn PDF document text
    • http://darstin.com/userfiles/files/lipifele.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7af72fbab21c00e70c42a43f85fc640e/3372477476.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///52078099196.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7eaaaf2c8---dudidosukujinowaja.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ac95ca9c2ecfd21664495033ac6b0e0e/dinemigofopuwazalenime.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/34975402542.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/75486279847.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/burepaloduz.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/nowifuvaboviwiz.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/rerexuzi.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/22b27623da2940bf20a2c77d245e43c9/29038999980.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca8fa5732a---74999843506.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/nuwuvoluvazugovidemefowus.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/pezujeropomusiwitipalixu.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210709_52330FC4C5E8FFD8.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9650865c3---wafezavototo.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/b631125450cb8ffc23d4ae98e0f6f29a/20057075653.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955fbbf20e5---60841376172.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/45013426751.pdfIn 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://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_off0000d987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD987 17660 bytes
SHA-256: 7ce9ef77745f27e5fcae7c7949d20de123dba9e6b0df28a2f330eff6c9f9895d
font_01_sfnt_off000107ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 11280 bytes
SHA-256: 9ef35afeab7f5ba811b29344bb699fae2fa977ed1fa9799c9a184cf27de7faa1

Open this report in the interactive analyzer, or submit your own file for analysis.