Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f00f2e6b26ba28…

MALICIOUS

PDF

97.7 KB Created: 2021-09-05 13:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a5f6060adbe788f83031c1b137c5cfa SHA-1: 5426ce01f4a5e23141c8e62ebb4ab8c5568c1d45 SHA-256: 03f00f2e6b26ba286b2f624811d6c6dfc95abf2e9141bde0c5fc0b66f042e750
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hrjok.com/uploadfile/file/gemivil.pdf In PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7afdd96f3f---27641553304.pdfIn PDF document text
    • http://short-story.ru/upload/file/munasumosifunazujagu.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/wuwaguler.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160854bcd52b55---76071544847.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3e97ab78258b909ebf494cc4cca34b9b/muwuraboxutuviworimolexod.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b23f69231b---92419550956.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/39633403936.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210607122109.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/jized.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/fuwavudakuzenezujirater.pdfIn PDF document text
    • https://petikdaun.com/contents//files/zimesugirara.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/sfgpqmjsjgq5sgs8cvk1n9k4op/birogubumirulegek.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/49042987412.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/98976736824.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/20432931309.pdfIn PDF document text
    • http://meta-min.com/files/59965019640.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/64006431550.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/51121496498.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/vebukulumegibusolikolatap.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/reparumivukufomito.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/28f1edcc26010926ec280e56ac501504/65269443600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hipaa+policy+and+procedure+manual+template+free+downloadPDF 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_off00011c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7C 16560 bytes
SHA-256: 65738d6b78f5d464e2bf7b52cf49538fc1332284e1bcfb2ec74515a338203c7a
font_01_sfnt_off0001478d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478D 10904 bytes
SHA-256: 0db26c5cba94450afd8d11e979d3c389ea30bd8740a85d47bac00b164956228b
font_02_sfnt_off000160d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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