Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c64fc2e6c84df85…

MALICIOUS

PDF

71.0 KB Created: 2021-09-13 06:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1455cfacbb617178c6054d87ef58bc92 SHA-1: 0a35fcb41574c4b1c837c8036aea58ca400ef8df SHA-256: 3c64fc2e6c84df85950aeef4e83eabd664083c8310ab2a99f551c0ae8a9b1a5c
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 and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://summitremodelinginc.com/userfiles/files/98708088102.pdf In PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ktnlfklg51q3rsvrfr3u0dsj14/98705909116.pdfIn PDF document text
    • http://bakoca.hu/files/file/genuzataxedigumotugezatu.pdfIn PDF document text
    • https://anaksemut.com/contents/files/lofomironezobewijoraf.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/warote.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/jumezejizamisupex.pdfIn PDF document text
    • http://kahasat.cz/data/file/97257742843.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/98aabc9c5e3d2ba835f2ede97f925f62/tusinuleketizi.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/duxuvaterumasubiwalijoso.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133b39c8c39b---xalezibe.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/folamopobowowo.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/hd3su0f9nend975e9o8qrutebp/memalumakomapiveweveloni.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/7479025727.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/6057299475.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/96097170280.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/55175180039.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/31004902513.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e640292091d9033292b8b23c1fd4a702/37909862474.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/72197292549.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/92771970948.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/gosowukodojaxujoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=appa+i+love+you+kannada+song+download+mp3PDF link annotation
    • 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_off0000b2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0C 16204 bytes
SHA-256: 78275238f766cbb1a3fef2f3039d8878c8a5f7a16542c93516426b3e56d0e47d
font_02_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 11148 bytes
SHA-256: 961507adff78890d96539ff3711498d2e389e3cf86b61b29095cf84a37e86e98

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