Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a453bc593e979ff…

MALICIOUS

PDF

87.0 KB Created: 2021-08-20 23:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0941636aec464754ab7ac47513b82b6f SHA-1: 84a200ebccc57021da6ea3c5d0384915f181ef13 SHA-256: 2a453bc593e979ffba98776cfb92bcd4e65b4a9e65c65a8bea9255634ac4e3b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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=thanneer+mathan+dinangal+tamil+dubbed+movie+download+kuttymovies PDF link annotation
    • https://iringmalaysia.com/ckfinder/userfiles/files/kagakidufexi.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/ribikawenu.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/fowukumojugolisake.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/54325047823.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/84308418095.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d63e7de337e6a9635e4324786069ddf9/dabotiganutegukojas.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086d50f56bf0---gabututejibizufunimugu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/4865fb7582d6b09b0dfa6c0cc8c419fa/49169444764.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/salisomoz.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/89865583344.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/3076555709.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/8vp5k0ra66g4ktboamrif36c0e/fawanobujukus.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/47459830225.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/katov.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/biwak.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2153e5eb63---654090287.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/6cad045b5d5520cf4f6c6e484e373e09/lomuterijumerub.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/koroxojotoxebulinabudapud.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/54713233720.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/xusumerunasizu.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/39bfd7a894979553042bc9c4f2403a66/jadobefizebovoxasitelu.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/pukutakizuvo.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/21748393472.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/pajif.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_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F3 11256 bytes
SHA-256: 2dd27423f6d5b663b8bf4d50f3fb586467042beeda7f30780abdfc5ba9a96ccf
font_02_sfnt_off00011efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFC 17908 bytes
SHA-256: 7063fdc531677fca7b996855367a37b7ac2539bce09ec786dae81a2f8262f19b

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