Malicious PDF — malware analysis report

Static analysis result for SHA-256 714264b9ef96bb91…

MALICIOUS

PDF

81.5 KB Created: 2021-10-06 16:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5d8fdd964fe528fd15037abaa0955356 SHA-1: 14c621acd99040543556a3c7a218c95fc5cd50ad SHA-256: 714264b9ef96bb916d896bb75ced0b2a857e2de1144d1d33392093a452da595b
164 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 ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, serving as a primary mechanism for the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=find+final+velocity PDF link annotation
    • http://hycxchina.com/filespath/files/20210930204708.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zenewasuj.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/19f000dd0e0d990813f42aa7c4b386f3/zivarimewavepojiki.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/derusow.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/90837472956.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/57018627118.pdfIn PDF document text
    • http://gzwep.com/img/file/2021923892.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/kitasamisurusadubof.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/38286856784.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/76816108330.pdfIn PDF document text
    • http://apple888.vn/luutru/files/vimililunavonuxek.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/lipasupadotefirovilere.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/4618376937.pdfIn PDF document text
    • https://airbays.com/userfiles/file/vununaluzizajur.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/71303714011.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210916115318.pdfIn PDF document text
    • http://budropol.de/Upload/file/95637234032.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/11430861122.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/41765243591.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/jisofuri.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/28678811565.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/kovilabuli.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a4039cf85b---padezudawux.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdcbe4ce97---seketidiseselelowagujik.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_off0000d99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 10356 bytes
SHA-256: 8d8ad7dc0876b89e0cfbf7d9147c668f3b4f2e5c024cffeafd0c3e4fdaebbfc4
font_02_sfnt_off00010932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10932 18208 bytes
SHA-256: 39fd288ade9325cdb2648847dbe5a60cb7895bc85f695a416aaacb658cf86649

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