Malicious PDF — malware analysis report

Static analysis result for SHA-256 84afd210d8d77894…

MALICIOUS

PDF

78.1 KB Created: 2021-09-26 19:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43979216661e1a45c0729d8f551a1fde SHA-1: c400afe5245821b4d9a1f6cca9fdbd25f67d838e SHA-256: 84afd210d8d77894718384b142f63f89a6591ec7940a3dd1fbe06812274189d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm designed to redirect users to various external websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://greenbiotech.vn/uploads/userfiles/file/92258976250.pdf In PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec81f838d2---83912036055.pdfIn PDF document text
    • https://dom-titan.rs/files/tunezivexuxeditovodip.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/29774485905.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee46513f5b---zozuw.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/83c155860d42a2c989bdbd035ff7c402/rifogorirujozufidifikozez.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/suxalibixitufigalise.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb5daf46b---60906437389.pdfIn PDF document text
    • http://effekt-film.de/files/file/80789735078.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-08/images/files/wazomowogemunawoxaxido.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/27552036983.pdfIn PDF document text
    • http://staropolski.net/Upload/file/66406539620.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/bujeganuda.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/56220013262.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/kowiwa.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613866aa637d4---virelovezutejujixivogu.pdfIn PDF document text
    • http://eko-uklid.com/files/file/miwitazun.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/zusuron.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/6664844136.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/82492697946.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/bobatasepogazamoxere.pdfIn PDF document text
    • http://www.andreapondika.cz/file/pesilibutinekido.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613641bcd6e43---jesikavabora.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/mugit.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210911_0CA37330B6764E2D.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=descargar+god+of+war+betrayal+para+android+apkPDF 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_off0000c44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 11228 bytes
SHA-256: 8d9d7b9cf1851890b8af1cd99b40a7823293e71748314d6740f684fde34d0e38
font_02_sfnt_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 19856 bytes
SHA-256: 926be669d701312935349a8315826de5548135c5bce93e38c359906ae6ea5a16

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