Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fd031f4fb9e482…

MALICIOUS

PDF

77.9 KB Created: 2021-09-15 20:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1ed36d1f10b7923c7dc1598021224dd SHA-1: 1a99017fa7620f1a7d07a494e4d1c2252386247c SHA-256: 44fd031f4fb9e48262f5d9c71a2bd1e06cf4b3196ddadce67e5ac14e927e2bd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely for phishing or distributing further malware. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=calculator+hide+apk+download PDF link annotation
    • http://acutecardio.ru/sadm_files/fewova.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/leparaje.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/31438740712.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/zugifowexisofevegevuxo.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1e0f90a12b2e7e70c092b624a9ec464b/molajona.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/39063653100.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/70391451489.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136761e37b6b---17190739050.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/pozodajawabutuw.pdfIn PDF document text
    • http://irollee.com/userfiles/file/5750522380.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/51497972055.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/madajotes.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210913121050.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c27bc50d5c---25093593969.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/73485703392.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6dca61fd1---lavofoxazejaxim.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/76992362585.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/31298914385.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/revaziramabufesidumutijop.pdfIn PDF document text
    • http://mariancozma.com/_user/file/18817544734.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///jegufiv.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/29591474417.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161309311f3261---94390449725.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_off0000cbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 17548 bytes
SHA-256: 3dfb49cd03691abb974eb8f95a086449adfe46d27bd75f9aed51e4c6a7843018
font_02_sfnt_off00011124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 10752 bytes
SHA-256: 48f669f28b3900b3bcc3be1ec5f5b4fda0db309d4ba5072de36350856cb07980

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