Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cd3e56249b23ee…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 10:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a81d67dd15e97b3474439ee4cfc157c6 SHA-1: a13605484b466e0c20fdc483090e475c23b255af SHA-256: 98cd3e56249b23ee7d2e5690d277edda731cd3acd1353fbb5f7c21667a0aa4a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on disposable domains or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://curvesncontours.com/userfiles/file/gogesatokarikod.pdf In PDF document text
    • http://iviltra.lt/images/files/38899285421.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/62148120353.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/54351741099.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/68862606242.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/43518089246.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/lowiwifawe.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/71704188718.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/kakaxufepa.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/97899520677.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/sobosumosifa.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/77526489222.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/zapukogotoga.pdfIn PDF document text
    • http://esteel.my/userfiles/file/goxizapobo.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210903100646.pdfIn PDF document text
    • https://auto826.com/uploads/files/tutaxonajepipel.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/55ae21113d1ecc5ba450ad277f14a808/71703005554.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131bc3f0dfa4---99549841547.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff92d6c77f---32608418966.pdfIn PDF document text
    • http://www.angels-rest.es/ckfinder/userfiles/files/25668031375.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/vesipaxiradukuxokezeperav.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210910173759503035.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/32776607154.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/tomawumefusakelaxopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=h96+max+plus+android+9.0+firmwarePDF 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_off0000d4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 18108 bytes
SHA-256: afaaba1e843150e2f4f4fe8c25a1c51fd01f31f15fdc4f71c71592d9a912614a
font_02_sfnt_off00011c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C12 11364 bytes
SHA-256: f8e82d86a1d8248758cc52ac5bccb5db5a0b5b01840dd3fb6a6da5ccf4bd21de

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