Malicious PDF — malware analysis report

Static analysis result for SHA-256 1633bd6fd2e2b900…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 23:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2f535dd6c597cafbc2a46f6753440408 SHA-1: 5cb1c44382cf6b6f94dd8c432b5ad8ab9684701d SHA-256: 1633bd6fd2e2b90028bdbbeeec70b14c4c92b9001832cb876dcef122944362f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613936512e3d9---38365007542.pdf In PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/xujamalofalet.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/11373925655.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/gudibulaxalexidaxe.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/28117129734.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/41206046040.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/jolikolefav.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/jorerevafomutibuxokezonu.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/mofiletelejalume.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/89550153177.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/24168910150.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/sipuzuvumomube.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/48945149665.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/16025371524.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/fupasadivurukar.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/51160410403.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/4607372757.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d8c4565a---pupelexunibo.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/57543042004.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/puzif.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe3a101f9---nubesufo.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109040053013145.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/refuropul.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1612f942aaa24f---gupirigowuse.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210903082258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=redmi+9+screen+hzPDF 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_off0000b8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CB 10484 bytes
SHA-256: 101313332fc4107256980803a846bc3793b6152f139547870b2780bc13b27d84
font_02_sfnt_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 16100 bytes
SHA-256: 89fe1cdbcae23f25050682efae180e352f94b7b19a621033eaf57659497535bb

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