Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc7264fddf52777…

MALICIOUS

PDF

106.1 KB Created: 2021-09-14 14:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f64ddf0e30add98d484e3113bc4bdebe SHA-1: 1b7a1def5df118b50056f23d97b70c00eca7e7db SHA-256: ddc7264fddf52777851d696be639cd67389a4aae07c0156db6cd96cb3a849b8f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a second-stage payload via the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • 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.
  • 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://greatnice.club/updatefiles/file/maduluwuramokufosoto.pdf In PDF document text
    • https://tsegypt.com/file/45579272220.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/tovugekewalumove.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/pezijurexeveturaf.pdfIn PDF document text
    • https://edarky.net/data/file/malukajavijozopevojaxu.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/86883614385.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/riwugedibowipodafurileke.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/pekozexagevuwat.pdfIn PDF document text
    • http://sbcnepal.com/images/file/71927891778.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/pemama.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af870b649a---9211548658.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163072064649149731293.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/topubadena.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161347f6d64b1a---togexebe.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a94515cd0b3b322e979fa58ba8bd205f/26773906644.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/38390906649.pdfIn PDF document text
    • https://frisch.ro/files/file/wupowujakesevawulo.pdfIn PDF document text
    • http://coachhouse.info/assets/file/2266914806.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/43323873062.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/godopogugowakagaji.pdfIn PDF document text
    • https://makenie.com/upload/files/12910471172.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/40960793675.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/6051f6d0ed7cf2d8862dd367b2fde83f/26628375813.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109050903319995.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/lolonekifuxoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mouse+pointer+app+for+androidPDF 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_off00013a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A76 10536 bytes
SHA-256: bab600c4eb4247c608bcfb2964303904d0ede9148b7f543e33cdb238dbdbba8c
font_01_sfnt_off0001529e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529E 18304 bytes
SHA-256: 93a9679943a53b8501a72daea612a8ac2879c819c481635d7bae03ea19a34d2c
font_02_sfnt_off0001821e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1821E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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