Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6eef2cddc19e429…

MALICIOUS

PDF

72.9 KB Created: 2021-09-23 15:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9efe2b1aef046f401d2f1937cbf8fedc SHA-1: b7dab49b1fbb2393730f80da2233a1b318856e65 SHA-256: b6eef2cddc19e4293ad79be5f7f69e178146fd3fab8f6af927fdab9180d5362c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://planetamama.ru/files/file/58325767001.pdf In PDF document text
    • http://emblem4home.com/UserFiles/Member/File/xesanazebe.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614125dd89827---dewesogarolulazeremoriv.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/guwonakasurix.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/23538874320.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/61817780758.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/89352769611.pdfIn PDF document text
    • http://wwstationery.com/files/file/xidojurazimoti.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/87689737910.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/34485524471.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/xokafoxolejejap.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27061332945.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/vinelugufonumaz.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/54762389955.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/referalojikejakajov.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/wuxixiposumafabigu.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109011553247250.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/59492971414.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/66729656430.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/22415983313.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/d0f01d0f2e75d93e2d5ee5b739571aff/69617323544.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/kotunosuwalinukajiso.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/34432822154.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/8huohcf2btvmuj5a1a586ecs41/mimifamejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=weather+app+for+windows+10+free+downloadPDF 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_off0000ba61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 16328 bytes
SHA-256: babc6ea37d3ba4062a306186e5f3d69a551fa642db6387687ee057b686e16d89
font_02_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 10848 bytes
SHA-256: 550510c2bb8cf4a936cb01dab81516d4c05f6fe0bd03bbf848d33a16150364bc

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