Malicious PDF — malware analysis report

Static analysis result for SHA-256 db87e4290fa68468…

MALICIOUS

PDF

104.3 KB Created: 2021-09-23 23:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c22e7d634ef36adef07ff69b5c45e5fd SHA-1: 18d052de47c501a6e24c8ea4cd582d41ae2530c7 SHA-256: db87e4290fa684680064c4eefaf2a40247148f1844644956cfc80e332a2afadd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://huntic.ru/uplcv?utm_term=kimetsu+no+yaiba+movie+full+eng+sub PDF link annotation
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130067eb4cbe---43565470905.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/53369121909.pdfIn PDF document text
    • http://fajni3333.fun4two.pl/uploads/assets/file/samun.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/diduboxanufodozo.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/toxugojonenixi.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/73vrvhu9fmo5jp6br617584fdj/movufudijetijoruledo.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/41683571229.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/vumudotopewareta.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/zekuvaxurerodararezobav.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/53653956110.pdfIn PDF document text
    • http://computerdoki.hu/user/file/10895302109.pdfIn PDF document text
    • http://mutitar.com/user_img/files/67075570267.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/4553708984.pdfIn PDF document text
    • http://amdind.com/userfiles/file/tijewelebuzuwifatulori.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/jozivulejomomuwamojakenis.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46696570138.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614053ab3478e---norififopabipufina.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/wojemozebizabivaz.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/goxagurizujutanulexakofoz.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/jubaze.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/kaxipimalanigoxovizupus.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/11188680228.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/23069406994.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/13091017942.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_off00012c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C05 20460 bytes
SHA-256: da91444c567ecb760465d98ed8d0a26a448c67599f92db5051038708db0fdd10
font_01_sfnt_off0001623e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1623E 10868 bytes
SHA-256: bf26175c592326a8f3434bb6036624dcec7eea4bbbedc476099bfedfcf5b11c6
font_02_sfnt_off00017b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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