Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fefcc0cb2ecad37…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 20:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 95138d9c5028a1f75faf97b0c6ab49e6 SHA-1: e45558fcbff81362dfb914a6e57cece06c9d398e SHA-256: 7fefcc0cb2ecad37a4522d4d05c048e562a57572eb7c09d1dd0dffc739a21236
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://catamma.ru/uplcv?utm_term=cara+membuat+aplikasi+game+android+sendiri PDF link annotation
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f970d0591---lofumumakejigabaromagav.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8cac227e90f29438067c95fd442e4567/tagixugorov.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/wekuludipivalimefenetiba.pdfIn PDF document text
    • https://successalpha.team/upload/files/bajanovu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/09bbe33d65f9f01ae41068cc6b3f6786/87702246861.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/62327773158.pdfIn PDF document text
    • http://szcftz.com/upload/zubasevedubupenenulujenim.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/lajozofukoxilogur.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c6a0389908f0d1c486bd7583792da3fd/wegomole.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2c7uh2l41434hmnima7sfmkcb3/barufakinukalawe.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/japegabuxaxegigo.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613487a5194e2---84602070825.pdfIn PDF document text
    • http://dominant.name/userfiles/file/15191596294.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/gukakivekirupunufegosinod.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/95276613708.pdfIn PDF document text
    • http://markone-tools.com/upload/files/42529903577.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/49049746881.pdfIn PDF document text
    • https://oferta.lt/i/File/selipitemezasufapapo.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/juzuvijunidebogenosi.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614272a7f14c8---12962706337.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/21330614689.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392d31b1bbe---36062138787.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109011652245610.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/fibaguripig.pdfIn PDF document text
    • http://i-physiology.ru/upload/purexifub.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/lawimopisimovavenajibe.pdfIn PDF document text
    • http://vit-physio.de/file/sujajinajafijib.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_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 11096 bytes
SHA-256: 72befee4b6b8cf91d0f403c7cad739239239fac74984ab3873491ccbc4f644a4
font_01_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 16356 bytes
SHA-256: 8d6ef7a48642148368b4506b76f71f7775a2145e6957fc5b415e129b8a67680b
font_02_sfnt_off00012245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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