Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55dabaaad585b39…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 23:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b0aa872fde85d0afcc223c9cace3c45 SHA-1: 22e895d13f3c3648d89ebac615bcf226e0e68c1c SHA-256: c55dabaaad585b39ad3068a950d89a7cef05f0f69eefe55cf52b8789ccee39d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to various domains, some of which are identified as link farms on disposable hosting or compromised CMS uploads, further indicates a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://812423.qqtogeljackpot2.com/contents/files/fivafutemosiwidoru.pdf In PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161420844252f3---vazurudekupolijikibon.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/51072198521.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613400d40e488---36569002602.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ed77d8279669877bd98fc2321c763c4/69908134894.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/wolifixirifovubomerewaj.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/zajokimorotis.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/qacbuhckm02gnft4d12n0b8lp4/xaromenulap.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/nomuwoxinefobefor.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/nemotinemowaban.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/5694643361.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/witifulukuperinivi.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/70253108072.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/49537466231.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/gudopuvidebawa.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/63177288011.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/mitadojavunasif.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/zixuseb.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/3466870711.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/nikudujepa.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/78250939431.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/tuxirofar.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/96206383905.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/99366259445.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/kasoselaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=watch+boarding+housePDF 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_off0000bf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF27 18084 bytes
SHA-256: a48e1a970810762109806c2c721c9c415d224faa5f242c474752a6d65b972d4f
font_01_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 10836 bytes
SHA-256: eb7f333d07882c4127b0ebbd67c4f0130395bcbff9dc3e2dd500ef1555709db6

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