Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd39f47597e15fc…

MALICIOUS

PDF

68.7 KB Created: 2021-09-24 16:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd6a4fd155f412eb1500eace43ae0da4 SHA-1: 03c506a3d939007e0ca70a5613c7af38a0f42efc SHA-256: bfd39f47597e15fcb14ff45372869d4d990daa64c4c6a12dbcf1840406a65058
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://sinching.com/uploadpic/files/202109130627533003.pdf In PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/kesagevoviwotemekoduwa.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/wosibuvugasepo.pdfIn PDF document text
    • http://kyea.org/imageuploads/selevuvavugezafoziko.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/3321734997.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/bobilitipuwet.pdfIn PDF document text
    • http://ibb-online.ru/f/file/1720527372.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/nafinulusifanug.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/nedodawedokor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416e978cecc---7123736036.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/19873547953.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/mirolanu.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/59246586062.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/talawimiwenoxabikemu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e93f08ad886aebb77df60f1df426482b/welabesidekevakanorebex.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/tisitutakavirudaravowiz.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109070809057288.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/31322214954.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16134617b05a4c---notebimebigusa.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/bekewogakisolemoba.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/68823382008.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7cc7167e13d87e2746338aa88863c5e1/xejotuwegoteg.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/tipidubunetosur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=share+screen+android+chromecastPDF 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_off0000af23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC735 15144 bytes
SHA-256: 9052bc51ca47217a54caeea6176f1d180a2a8c42f08501b205a3e0eb77e782c0
font_02_sfnt_off0000ed35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 10664 bytes
SHA-256: 1b842dae9c043de47b1c0a44c80d8b8aa1674d527f84363461310e4a0003abe7