Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bdc4ae4962c42d7…

MALICIOUS

PDF

93.7 KB Created: 2021-09-19 05:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5277ed06601b35b00c00bc1ba03faf42 SHA-1: bc8e3d3ea088f52aaa4d0760f9220a4f7ee526db SHA-256: 2bdc4ae4962c42d7589b861bb6667a1410db4caa645195b31d752287f61f8f32
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 CMS upload storage 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 via these links. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wastran.ru/uplcv?utm_term=why+do+androids+have+bad+cameras PDF link annotation
    • http://medicalproduct.hu/images/files/pepomidudopagikeruxej.pdfIn PDF document text
    • http://grabnerestriche.at/811205183.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614424e7859ca---49636838787.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161442ba88c5cc---12937029427.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/86023182931.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/84626854504.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/27422101538.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/makinadus.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/3877989860.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/83077612880.pdfIn PDF document text
    • http://leguido.net/files/zenefi.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/74400694019.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0543e81c3e63471ccb388bc4bad91e5d/sewuxotekim.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/74770902468.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/putug.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311d7934f9a---vazofeturem.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/80270961693.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/93902305679.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109140623106302.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/musefafinarogo.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/3058949240.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/gukowavavibikojozuwaro.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/xedop.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/voraketuvikedil.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_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 19556 bytes
SHA-256: 9662050ad72504763f7ba5b09b13926b8f9eb1b7b6aae2acb1f2de47526e1f64
font_01_sfnt_off0001381f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15036 10804 bytes
SHA-256: c7ca3cfab86fa5a7ede1ec206eb824b79fd391b673d35d834ac572037266630f

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