Malicious PDF — malware analysis report

Static analysis result for SHA-256 8095c880475d67d3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 13:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68d64fe7a2b8c939b2dfcd72ba488ddb SHA-1: 7b94139fb71766f729ab77f73c3a0b7c75f5d8af SHA-256: 8095c880475d67d33bf6b3300e20166ebec4d75912869357559e9ca504b6d2ff
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as http://keystoparadise.com/userfiles/files/66310590760.pdf, are likely part of this redirection scheme.

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://keystoparadise.com/userfiles/files/66310590760.pdf In PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/tenidikovutalakelojatude.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/57883991101.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/26975817561.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/zuvemaxoduzugapal.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/pomuxevowozutanono.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/4567486096.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/23074272301.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613258d36f377---fomijujajamupevuj.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/jeraxakivovita.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/malukazapok.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/vufajutugazugizapo.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/mimit.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132515d6918a---95528091102.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/rilomujatuwov.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/sofilatusiduvubuxifoda.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/44601955964.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109132146433686.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/84396571118.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/xevigovovejug.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391caca2eb2---loboxezavufijomi.pdfIn PDF document text
    • http://bamila.vn/luutru/files/12316268218.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/satunonekebisikenobiragu.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/bazatawoberife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=john+murtagh+pdfPDF 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_off0000dbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 10596 bytes
SHA-256: 0441047fe2443b673f4728584636728543468128b0821159acf3991029e0de18
font_02_sfnt_off00010bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAE 17868 bytes
SHA-256: 6933e1397cbaea6c196e1d42ba56d607030a1ff0ffd4bb7fca8a005e7690fe59

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