Malicious PDF — malware analysis report

Static analysis result for SHA-256 849fd2633c862612…

MALICIOUS

PDF

89.3 KB Created: 2021-09-15 13:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3297c016e3e8d19a16ec5b2b04529bb8 SHA-1: 9dde6184606743f92bac08ef1dc3f07be1f534fd SHA-256: 849fd2633c8626120069c24d53067ffce0392b12af8de6916278623d858121b7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to host malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is a social-engineering tactic to prompt the user to install a browser extension or update. This likely serves as a lure to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cructi.ru/uplcv?utm_term=does+chromebook+run+on+android PDF link annotation
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613053bb24dce---difuvelide.pdfIn PDF document text
    • http://handgun.ee/media/file/pesuvofupasewo.pdfIn PDF document text
    • https://dptech.vn/uploads/files/35918170629.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/36418437012.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/mupekonogupej.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340966e50d3---ponagumejipetovejijoxox.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/69228279393.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/10462221966.pdfIn PDF document text
    • http://orderkai.com/uploads/files/57637122878.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/dotiti.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a6a951519---65740273854.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/53926698363.pdfIn PDF document text
    • http://partnercable.com/files/nadalapudazodisonolepa.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/muzijuwejobali.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/25093290999.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/medasubu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qemett7bjpb1ciklakv7m5ids4/xebubodiwexu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141127f66779---99661879005.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/86942517516.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/bimajarimarem.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/56113687172.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/23183565743.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_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 10824 bytes
SHA-256: 46b34bcf8352841ddf9dc17d82b62634202c6df09c5e605d828442b9d93a6658
font_01_sfnt_off000110ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AD 18068 bytes
SHA-256: 0730c9325ec8dfddde9ecd1de16f5e17ce29eae826601e714df3c6f4a53c4064
font_02_sfnt_off00013f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.