Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa4397f5382b327…

MALICIOUS

PDF

73.4 KB Created: 2021-09-26 06:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 406345ece47e104fbef6b19a957d0027 SHA-1: fece0e28416e437598381bd6ba7fe9c20f8db442 SHA-256: eaa4397f5382b327fe04d7ff019d98f744c177f3e07dfbd90513533cb7e92cb4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised or disposable domains. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection and ML flagging, strongly indicates malicious intent. The primary goal appears to be directing users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://oniceh.ru/uplcv?utm_term=carry+on+jatta+full+movie+download+720p+filmywap PDF link annotation
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/redulaxewopon.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/40903479927.pdfIn PDF document text
    • https://ksuskalology.com/images/file/88544125587.pdfIn PDF document text
    • http://leguido.net/files/53576091588.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/bupatoziwuzitojefexu.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/91604749729.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bcee59100---pudosilidesip.pdfIn PDF document text
    • http://storemisr.com/uploads/files/35075702401.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c67b09a1---3320000028.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/widipimumi.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/68974951321.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/4f18d43de4ef5338ca828865e6c353e8/dinakalosigigemod.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/punarari.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/cvipkj8gkjp21fn5cgi7l4o2h3/12559687001.pdfIn PDF document text
    • http://jinyezi.cn/upload/kigunelozovavimases.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/aaprqn1p3lkmhgn0588anqmc4e/komisizusobaxux.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/6670259990.pdfIn PDF document text
    • http://taichielite.com/louis/taichi/ckfinder/userfiles/files/15228381674.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/19525286502.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/kejenavupefiduwutomazez.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/xozukagujomumigowixesexo.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/35837947116.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/momodiwevitilipim.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/bujeburusekamu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161367d7c22859---bagapufediwaludaju.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/6871540784.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_off0000b961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB961 11308 bytes
SHA-256: 949b63580186b631143cab97c4ddb7b0b0897ee8372967c41023559b929d87b2
font_01_sfnt_off0000d413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD413 16996 bytes
SHA-256: 194c11af1db2f88e361c172ca4f8f9bdaab62499e190fe0b3e10fe145cef7f82
font_02_sfnt_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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