Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e1e4ebcef7acf7…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 01:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20107e4850e74d7ccdcc2211a266bbfb SHA-1: 2cdfce2a6b3de7e319a204360fc0afd7e2ae27c0 SHA-256: 18e1e4ebcef7acf7588b77480259f7cd888aa34858b4f712d762fd0ce66a9432
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document exhibits multiple high-risk heuristics, including lures for remote support tools and browser updates, indicating a social engineering attack. The presence of numerous external links, many hosted on disposable domains or compromised CMS uploads, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download and execution of a secondary payload via one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cructi.ru/uplcv?utm_term=alternative+for+vysor PDF link annotation
    • http://ourpreferred.com/userfiles/files/28997939095.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/99496690799.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/mapobobufugimezalev.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/20909033419.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/xutezunamamesenuzajuritib.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/17780821458.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/feparudemogo.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/27275933218.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/sajikomixeliv.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/zimavovig.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/74341099435.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ea2f1b9af3dfccce31332d765e02ce6f/disiganiju.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/97285827671.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/sirodugi.pdfIn PDF document text
    • http://grabnerestriche.at/12181807033.pdfIn PDF document text
    • http://nscenter.cn/upload/files/31352386962.pdfIn PDF document text
    • http://dasbluemchen.com/jololopi.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/70721731646.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/92310983057.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613801134fe24---penemekop.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131bf0cdba80---jekaxevadebokejeviwid.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/11371933566.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/33858549570.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_off0000cdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 18396 bytes
SHA-256: 0916f7f9d65e7a20160ceca06d4c7cab85842dc061a4014ed5caedeb60234b1f
font_02_sfnt_off000115b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B0 10368 bytes
SHA-256: a985d8781d8875d71cb7716b9e24fe23e1e5eacc7692f47ce7847c6f1ee20c52

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