Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03da7b62ad3eb4c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 00:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b82778fd9a14f3463bb20a2d47098dc SHA-1: 9694bdc886d2b7d6fc0ea75728f3ac4c3f0e0949 SHA-256: f03da7b62ad3eb4cd0642947d73d3bbf07d63e97734d7a51cef14c53720c04f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which are part of a link farm. Several of these links point to compromised WordPress upload storage, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://synerhu.ru/uplcv?utm_term=five+nights+at+freddy%27s+android+free+download PDF link annotation
    • http://studioarclab.eu/userfiles/files/nokakuliwovem.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/31299380681.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/fasefepokuf.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/vikotideguxigeni.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/webexotemikanot.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/28432238296.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/gikilugadale.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/66691078526.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/wipinomavave.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/64392314991.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/larunisipobuwok.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/jaxekegadokamanukutawupu.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/samunujubozamusaselogeseg.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3j4u6c2j7k1ta4hhvufavpqjh0/3723665885.pdfIn PDF document text
    • http://effekt-film.de/files/file/42099746062.pdfIn PDF document text
    • http://proxima-design.cz/files/file/83765587438.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145055cc4153---56677727614.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9c53522d547ae2c2a6883386f50c5ca2/wegufolunukidaxemedat.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/99130127815.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/18488384168.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/midelalepubotuvixibupot.pdfIn PDF document text
    • https://5uempat.com/contents/files/51287962985.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/47794726459.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/88736612037.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/26311251348.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16134cb1d91153---80987669227.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_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 17776 bytes
SHA-256: 8b9c3e3aeefe2782635b578d96d43d098dd886e754e4846e38d2beb059ccd165
font_01_sfnt_off0001034e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 10912 bytes
SHA-256: 622a4fddebe1ecc78402ae157d15bb0d5e3fe60e18a5846269de794f9846a3fc

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