Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fd56097da529f3…

MALICIOUS

PDF

79.5 KB Created: 2021-09-23 07:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c18aefb542f219ba6687c66d906bccc SHA-1: 170a40254ee716f95cd9211f7caf80324897e37d SHA-256: e9fd56097da529f393743d04e53c5554968d74ba192f1c4734b8f9d8cc6def14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external sites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://toanlinh.vn/upload/files/gifofutuvibobisovog.pdf In PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/mizaxebum.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/najigebivaxevox.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/juzalonuruxuwidateduxuwe.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/6234910823.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9df9b51ce---lifowamu.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/76090955994.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/4385773817.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/75427848781.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/pubesenebid.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109111258109583.pdfIn PDF document text
    • http://domario.ru/userfiles/file/99693517355.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/gedaxoweparadi.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/naxenuze.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141c648257fb---90787156586.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/88224249138.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/gazilobimivofufukofowaf.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613705136dd94---81088111564.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/pasufigug.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/mukavelowelinatozupeb.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1471030e6---10096681483.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/44728359606.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134577af0d6a---81264640535.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae554d7797---guvanonu.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/lifobimax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=amazon+shopping+prime+mod+apkPDF 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_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 10828 bytes
SHA-256: ec5dd2119eed535fba24ddc4fa835a53499a849686ab53787c6c1074357abde5
font_01_sfnt_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 17216 bytes
SHA-256: 73b448e0e55ca852c1fbe893b489086aeaf41aa8f8398e5c1edb0986d2720916
font_02_sfnt_off0001184d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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