Malicious PDF — malware analysis report

Static analysis result for SHA-256 427c547c52f75731…

MALICIOUS

PDF

92.4 KB Created: 2021-09-16 05:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db9a17dbd17c73dd6995633124d31e5f SHA-1: ad52352d95b602904385399963790a3925b504da SHA-256: 427c547c52f75731030a62402e0dff362c6f982c7326f4e1a4a2c7ad4e82ac2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate that the PDF acts as a link farm, directing users to compromised websites and potentially disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://ticketsperiodico.com/galeria/files/botoganefivivufubipexig.pdf
    • http://radis-rrl.ru/userfiles/image/49489520046.pdf
    • http://aviapartner.biz/js/ckfinder/userfiles/files/wezoxajonekugogi.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/cb8638f5418402f4f4f512fe3dcefcd0/22719918490.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09140b089---65384233547.pdf
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/gofibavazojovimezanu.pdf
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/83578525226.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/bda3f13054f3c632985e7be15360c903/93174296764.pdf
    • http://maristaslardero.es/userfiles/file/mofiwujusu.pdf
    • http://liweisteel.co.th/ckfinder/userfiles/files/8642901949.pdf
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/fejufuwozugozafa.pdf
    • https://artgreen.vn/attachment/files/87675676663.pdf
    • http://aokunoil.com/ckfinder/userfiles/files/ripujasarewa.pdf
    • http://cuanhuaabshanquoc.vn/files/15359538883.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff07112bee---muwawizumeneruno.pdf
    • http://lepetitjaunais.com/userfiles/file/girug.pdf
    • http://webursitet.org/Files/file/vabopedonokujajosufetak.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417abe93442---nimuniriwibatorotibabu.pdf
    • http://liebherr-tr.com/userfiles/file/28906450348.pdf
    • http://fatimaartwork.com/userfiles/file/bakamitasabugukebiwitiva.pdf
    • http://arniestribu.com/campannas/file/masalavegukar.pdf
    • https://dhrc.in/userfiles/file/gezemowoxakowamebubopeb.pdf
    • https://ofly.om-digitalsolutions.cn/upload/files/mitokajo.pdf
    • http://archi1919.com/smlclub-files/file/51426985660.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=yacine+tv+apk+download+2020
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e22e.bin
bf31be7827b72650f973ec0fc1938031aa62aef107f97916b1200e7e5f245cad
pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 10708 bytes
font_01_sfnt_off0000faf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 16792 bytes
font_02_sfnt_off00011309.bin
fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11309 16160 bytes
font_03_sfnt_off000128a0.bin
21d712a72d580390e23f7512f4d3b3001110737944d87ca13509bfe891d299f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x128A0 22940 bytes