Malicious PDF — malware analysis report

Static analysis result for SHA-256 3102917f9f94919c…

MALICIOUS

PDF

77.0 KB Created: 2021-09-25 15:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13a4a95b7c3126cc341c20b4907eec66 SHA-1: 62a4bb1e41dde21ba43d973933b7026c23263fdb SHA-256: 3102917f9f94919cc008b22869ae74a447f7a98e482e09c1a13962bc0c4e60bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/43725920425.pdf
    • https://tdfstore.it/file/fonifuzelomi.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4c1b624e6960b38f4d15735657749d8e/37459357500.pdf
    • http://carscaso.com/js/upload/files/fuxuv.pdf
    • https://meritumptt.pl/dokumenty/file/80975737239.pdf
    • https://takarasushimn.com/userfiles/files/22063440976.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9156a290f0e54e0cbad1785b131cafe2/pelurareja.pdf
    • http://jcnjl.com/userfiles/files/59476437202.pdf
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/ruropifirimofufolali.pdf
    • http://woodlandhills.ilovepokebar.com/uploads/files/xasaji.pdf
    • http://missteenqueenuk.com/userfiles/file/xalimoputosatobuguvemug.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f10ac9ac98---womebokomewimojumokimufi.pdf
    • https://tybistanbul.org/resimler/files/28272086239.pdf
    • http://aqs-group.it/userfiles/files/22252893798.pdf
    • http://cgl.lu/userfiles/files/40654283667.pdf
    • https://birgatour.mn/js/ckfinder/userfiles/files/68302215854.pdf
    • https://maydangson.com/vietkiendo/upload/file/mikefim.pdf
    • http://twapp.freshkon.com/upload/files/wololiwiwonekofepagixax.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/28614633654.pdf
    • https://idroilektriki.gr/files/file/nufezasunosonazadam.pdf
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/janujorituzev.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/5025387824.pdf
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/kabezaxapupapu.pdf
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/10851884742.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=oregon+trail+mod
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c348.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC348 16792 bytes
font_01_sfnt_off0000db5a.bin
8cad0242854795119a03302dbf7366d11e72ef9f2d5888363f9972dc21f48851
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 20188 bytes
font_02_sfnt_off00010f01.bin
930dc7a34aa7457468664287e1b5a9131deae0e94ce7cb6946a3a375bdacec0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F01 10448 bytes