Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c56981ce1b0769…

MALICIOUS

PDF

92.3 KB Created: 2021-09-13 21:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 365dec38f4f767b5c1f10d84d7032f66 SHA-1: dfdf56f695daa2cdb61dd81ae71fab3772520455 SHA-256: 54c56981ce1b076938e6073dedcaea0ba65af6f275561cdc48b631a9695899d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs. Several heuristics indicate that the PDF is a link farm hosted on compromised CMS uploads, suggesting it is designed to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=lust+story+full+movie+movierulz PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a809e44d7f---22249309893.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/41735519893.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109021702107716.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/79632874755.pdfIn PDF document text
    • http://tdbm.vn/upload/files/67380636856.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/15130938378.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/tuvenitorafulivojaxizemi.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109061548026171.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/ruwes.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/tabejif.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/dewewoxuluj.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/59165419635.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/5c88c62ab1971112a5a58f2ff6be5910/75138236453.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/57636648081.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/52081280311.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/86281412508.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/45381896237.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109010803067231.pdfIn PDF document text
    • http://esejsc.com/upload/files/35658846587.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/8730ce4bf92991bfedfe05fb811391d0/80733916326.pdfIn PDF document text
    • https://eguiders.com/uploads/51148786064.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/84621190949.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/19550701198.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/kixuxesix.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/jinikujumegagejo.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_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 10408 bytes
SHA-256: f0312d443fb51edc343eb9e7f9a6b64236e01fc7445cb326079f947843c50c7b
font_02_sfnt_off0001340a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340A 18120 bytes
SHA-256: 11871330978f0c72af45829de1afc335d61908902a7cd3c3ad770422123e6787

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