Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3dbca3dd49e4e83…

MALICIOUS

PDF

78.2 KB Created: 2021-09-16 05:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b810f7f8266e1708589a4ad098aec42 SHA-1: b7bcd1f28f9aa8ab60d641820e81e692e0bf4ee5 SHA-256: e3dbca3dd49e4e839c4bcd7af22454d50292b7b46ff2e7f4addfb08afc117b52
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains or compromised CMS uploads, 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 0.9940

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://oniceh.ru/uplcv?utm_term=beauty+plus+camera+android PDF link annotation
    • http://fresh-j.info/images/uploadedimages/file/30246654089.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210911093728.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/dujavezamadonevixib.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/kuzovotifunakuloborisa.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/zaruva.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/64990053938.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-7/20210907045142916586.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/bikepejodi.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/78059314780.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/feduvabalefowifudeb.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/roweselirokar.pdfIn PDF document text
    • http://uco-kampen.com/media/files/25641727511.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/kajipukuvumobapevumu.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/pogetip.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/35345473563.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/jajowidugexote.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/33949221306.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/14007621509.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348f89c261f---zanotabatategavose.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dbj1sh39p9du8fnmhghq3tj663/melikajumufitovo.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/rurezegubum.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134eebee0eb6---87298470468.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/95814380628.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC2 16192 bytes
SHA-256: 126aabc53b187bc4421529373f04e2f66a11804dfeaeb35cb650b132d56c1dbd
font_02_sfnt_off0000e36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36D 10944 bytes
SHA-256: fb8692f183b2e8615bee5108ded2f1436cbdbb7cf74011816fa5db2422955dba
font_03_sfnt_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 18556 bytes
SHA-256: 2f41591260b5d53a22ffe6c1a9087f3baf2073d00071ca4114be1d33a3b5ed7e

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