Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ec8cc95151436f…

MALICIOUS

PDF

86.2 KB Created: 2021-09-11 03:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03ac1f92a7d317323a3d69017ece92a9 SHA-1: 7cf85ebc93706e6a5202ba583ccc0d96e347127e SHA-256: a6ec8cc95151436f7ca6f5034d9ee3eda4f37f7c5125bb1838390be6e33f22ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://kimhoatra.vn/upload/fckimagesfile/temujoxalajidufipawalun.pdf In PDF document text
    • http://uelzecht.lu/userfiles/files/ruwejukoju.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/62811267397.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/fowerimawebewolajirekabol.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/89091854330.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/tilekawubifefivax.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/59f1dcbe16381ed5cc4c69d5f68dfb7a/89569215447.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/22106689390.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/fasuvol.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/17681500152.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/limunujimupupadetopebu.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/sidulokiter.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/10789719487.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/tujidikuto.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/39965103385.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/pivazipopamesaligin.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/77089500630.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf18f17af4---nuzorexogafireguw.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/samipekuweve.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/fewil.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/konenoxojemijopopegejoto.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/e98220a9a4bdd889fc97fd07b2d08e3d/nubadotidowetididudomebag.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/varugufoja.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/jizijewolebarazevelamu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137379711f2b---katokegow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=upper+lower+full+body+splitPDF 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_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 18004 bytes
SHA-256: ce04e51bef69ddc27ee1f65aa1dc852017ab6ceae185003aee863fbb701562b7
font_02_sfnt_off00013296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13296 10672 bytes
SHA-256: e735906363307d4facb973ac8574f7ec1bff3e630c33774490187f442741caa1

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