Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc97a943b078f3d…

MALICIOUS

PDF

87.4 KB Created: 2021-08-18 08:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c747eacdeb5111a8c40fbf1cfa4b6d6 SHA-1: a170da45bf0fe4a008c3ebed32e8e56f168a5eea SHA-256: ffc97a943b078f3dd80c54175d5707575477cedc74592ffaa5ef3f9623b753ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the presence of link farms pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=how+to+get+e+aadhar+card+print+online PDF link annotation
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/41fd8b6e8987e91433497d7fcc786ca2/kevametubupomarazimiz.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ij0n6g39bninu0ofg3pv89picf/44262083640.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/digukajavaneremin.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/15390851269.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b208548a3---fevuwafobemivuwudemofupik.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/71261952792.pdfIn PDF document text
    • http://yanartextil.com/firma/files/82471433450.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/fuwasapagodu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6088ed869---77297746144.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/lasat.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/60782076400.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/017d34a6300ca59e1829ce806e8782b1/8616664716.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/kokepolevetepetabozakez.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/xudivagakitiposodekav.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/samoxogixagukaguwuribosut.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/76946607170.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd38e677c3---66418296970.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/c09a87d311d8ca43ceead19485ceee14/76839357871.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fd08d424---nabuserugilagixudar.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3dbb85a9b---47896797606.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086354f2e81a---zelexaxumepane.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/nhdo2qfj43qt3p2k4hn58ijj31/48217522120.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/64239748501.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/rutezuretazop.pdfIn PDF document text
    • http://sayarbobinaj.com/file/8521240453.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/c0ed60fca6add8319593b4563b725441/41985986490.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/wotexedunozisezogadizagew.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_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 17332 bytes
SHA-256: b4bc1146e7e1005287bed8aa91d841ed90eaa12c3c14ab619dd3fc9870154e41
font_01_sfnt_off00011f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F19 10700 bytes
SHA-256: 36d0ec946dedfccec27a1cab2fbb29bf3f92955ec97eacb7167dfc39d4fae13c
font_02_sfnt_off00013760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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