Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53c28d675a064ca…

MALICIOUS

PDF

90.5 KB Created: 2021-09-17 07:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b6fe9017357955b75dd18259adad48db SHA-1: ef1a655d0c5d2e31a57a09d4623220f4fc59fdc3 SHA-256: c53c28d675a064ca244b39e360862369d3de6b0c1332c7d3a7d6dace89d61bf2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://irlanc.ru/uplcv?utm_term=the+push+strategy PDF link annotation
    • http://48bulls.com/js/upload/files/pozug.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/telulekawokelibawafave.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439fe80b15f---49093996239.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/xiviwix.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/jesawovutosu.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/tosizitubomema.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/bobotugojedidopavuribeka.pdfIn PDF document text
    • https://naves.cz/res/file/dagujidokipiduj.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/fudegimopivemos.pdfIn PDF document text
    • http://pactolous.hu/upload/file/lezawixenimigagewuwokixid.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/gejejipoja.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/fejogosus.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/84584754882.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4c7e32e61---99672424294.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/51267005681.pdfIn PDF document text
    • https://camelcarpet.org/d/files/keruxa.pdfIn PDF document text
    • http://ranch.pl/files/file/titojepe.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/28559311430.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/kiriz.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/sinusonetipejip.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/zukavodabulojida.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613077e46d2f8---52764762969.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/zedelusosajiluwomovaxaneb.pdfIn PDF document text
    • http://8njl.com/userfiles/files/26645918941.pdfIn PDF document text
    • 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_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 10344 bytes
SHA-256: 1845aa03fa73c91a6c82328019646cee4b5b027bc417b0a3a7fd04e11637242f
font_01_sfnt_off000113b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B1 18988 bytes
SHA-256: c7610c11b1ae70c4b126d89a8fc1f32e7fa3be86ab0a1ae76da89fa0f70c6d02
font_02_sfnt_off000144ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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