Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9c2b5003cb6e5f…

MALICIOUS

PDF

98.7 KB Created: 2021-08-19 17:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a527de244265e51dd93c6c8498a3f83 SHA-1: 1b3792aa2cfc7b8ba3f7df52e117e7f01715ef85 SHA-256: bc9c2b5003cb6e5f09757282a4d4996dff1d47f77586d576f927f59136d6ac09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://messianic.live/wp-content/plugins/super-forms/uploads/php/files/88a7df63e82f31f3f4f304717728b353/padorok.pdf In PDF document text
    • https://careersourceokaloosawalton.com/files/public/mesokudo.pdfIn PDF document text
    • https://unosms.us/userfiles/file/33958863613.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/g0popk65r555rikufrcpuf08p0/vuwomovavet.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a17bafdb6c3f132ded98924e6891d54f/jojojek.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/nimidejenafupusaxu.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd4d88b8e---47816888626.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/80959041908.pdfIn PDF document text
    • http://veivel.com/userfiles/file/85620387788.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/ganopepoduminizoso.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde4e24ae5---60766811597.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/mevezuvine.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/verilavupafajuxuk.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/4kkokkpcpml9odpbj7bekelte7/mufekexeku.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/9010114435.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210808_220227.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-8-10/20210810174301834475.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/tilorolexisajiwaso.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/4833004848.pdfIn PDF document text
    • https://x-software.cz/data/file/tumimugafuzokovoja.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/mt0ksch3rsfrb2b9r1j606q9p8/92357062844.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/52945309751.pdfIn PDF document text
    • http://envigest.cz/upload/file/topabuzunaboli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ejemplos+de+principio+multiplicativo+y+aditivoPDF 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_off0001167a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E91 11068 bytes
SHA-256: adc4b777f02aa4ec67b2416425b8b423cbea9662d733d3f7d3a864abf0a83684
font_02_sfnt_off00014847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14847 20104 bytes
SHA-256: adee23cb1f39568719fd98bcc562c28b908b5ecde82a540d5ab0e9096617ac98

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