Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2449d633b961bca…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 10:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 04485eaff4b1f14aee1325dcf72a05b5 SHA-1: e3896ea2a0ac90b1c664f96f73b835241ac2a0c0 SHA-256: a2449d633b961bca4646aaed7d1f92d85a234e8f16bd44b39a7462caa5fde006
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=feature+article+example+for+students+pdf PDF link annotation
    • http://clinicaveterinariasangiacomo.it/userfiles/files/jixaremotuvibizewiw.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/segidujagatalugorape.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/sorifevi.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072391250290---lurogaxat.pdfIn PDF document text
    • https://harom.ro/files/file/puvunetelinop.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa5309c01---pekezexapefibeda.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/jezilonejunefabifugi.pdfIn PDF document text
    • http://wirheiraten.de/images/file/niwajudorepavibirubiwomot.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/fazunamawezut.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/jagonewisikasowetinedabu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/segubavodurinagu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/000a44e54e35f965c0a32aa393dc21b3/xejuxitupufus.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a36415fde---74257230709.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/9331528797.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/21420596588.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4025f222e19913652b09c29279f2c225/97807391271.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/8af8a33352065d933481a670de9ccb72/98853611755.pdfIn PDF document text
    • http://bselink.com/userfiles/file/nemewemekuripapafemajib.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/zewanarunilomomokejige.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c0b333f97---87224663238.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/vovemodibiwerikuvoriw.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/9f198ffa3c8b6d700aabaeb65df355d6/libowadisinemume.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_off0000d290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD290 18912 bytes
SHA-256: 5d6249ed28f1e6ef5e251cccf372e52899488314d97f667f913c92f06ad634bf
font_01_sfnt_off00010364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 10960 bytes
SHA-256: 5c78d18eb22e4a18e5965a904153bea84fd205e1d6af89602c6557707e325cf4
font_02_sfnt_off00011cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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