Malicious PDF — malware analysis report

Static analysis result for SHA-256 a043b4d1eebf8709…

MALICIOUS

PDF

56.6 KB Created: 2021-09-28 06:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1107fca40bcd44c43e130824b6aa4da7 SHA-1: d9ab36e0da1bc7d1ecf671c352d039972b7389b2 SHA-256: a043b4d1eebf8709e5123e69dc24a84c68000fa3054453d50844ea0947a0832b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or scam campaign. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7603

Heuristics 5

  • 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
  • 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://pixomot.ru/uplcv?utm_term=iphone+se+animated+wallpaper PDF link annotation
    • http://khmim.com/ckfinder/userfiles/files/mevugaxesuvututagovetigu.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/koreden.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/sewogeninu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b24f56423---8967252162.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/tasurubis.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/63839803565.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/3308043745.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/mamomatizefezonu.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/69853135037.pdfIn PDF document text
    • http://sjhtractor.com/d/files/7654758074.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/39625852219.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136896c22cac---gujamikilisumugajetivodeb.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/55523290616.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/keteleberetumisitijaja.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/xobijado.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/gonewejerazuvovawofop.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/wolilib.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/89362350484.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/pudizenijiwefimuvezinex.pdfIn PDF document text
    • http://fitviewer.biz/files/file/penoparakudiw.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/dofulunusakilijizaje.pdfIn PDF document text
    • https://people11people.gr/uploads/File/lonebetoximidexokuzan.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614821b6655cc---jovabijoluva.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c628371999---wetotigixixibukumafowasan.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/mdq0v6ief4ps5ss4sr850aq96a/63773586822.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B0 10692 bytes
SHA-256: bba3de40c3d51c82dfdb43246538b4edbe571b0993744161bb6fc638f2c36c16
font_01_sfnt_off0000cd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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