Malicious PDF — malware analysis report

Static analysis result for SHA-256 b572a0756c727f03…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 03:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19ee74c3a4927119b2799d9817a9675d SHA-1: cea07893cb45603f9e2436d0f9491f9c6e4ec4ae SHA-256: b572a0756c727f0381e13faa4bc18992224eb1865014933dc6b16599bdca77e6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised or disposable domains. The heuristic 'SE_QR_LURE' indicates the document likely instructs users to scan a QR code, a common tactic for phishing or directing users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to execute JavaScript and redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://inwebjor.ru/uplcv?utm_term=qr+code+android+11 PDF link annotation
    • http://oa30us.com/userfiles/file/tezarogaresoxotixoteb.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/93565599748.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/jiximadelenurejiduleraf.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/69627011156.pdfIn PDF document text
    • http://kco.su/userfiles/file/60625919761.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/12778938666.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/penivilakobazigefugaxu.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/tuvesogikiwufil.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161432a769aacf---94076161765.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/wememaxulajutewupave.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/12282213485.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/jawenaw.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/lamikituwofejadebutuja.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/gekawesibidesebuwulataxur.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/tatowimovuvo.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/fodofoferisejebofoxomagif.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/65183c9fbf0866af42f48da9135aa11a/pofigojikunuwotobazopidiw.pdfIn PDF document text
    • http://nessium.net/userfiles/file/netazixe.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145abbb3f10b---gawujebinozisevenovazasox.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/47406322015.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/fipetatijazogaxofokovi.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/91343557179.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/20541359486.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_off0000b364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB364 10164 bytes
SHA-256: 4d79908f06974bc057c3f206be3eb92b4dab0bfaa3f1ffe2c0d68d24cc060bcd
font_01_sfnt_off0000ca4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 15976 bytes
SHA-256: 3b11da833bf9cf583e91e436a24327932f1495a05d9df53bfed296fed38b495e

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