Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7262a346072fd0b…

MALICIOUS

PDF

88.3 KB Created: 2021-09-02 23:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9de5cd96ff59755b626f9ab71356ab6 SHA-1: 932602af06b755aa7063cb0406d388fe41fd0d22 SHA-256: c7262a346072fd0b5408e48bc930e39bfda66b5345885b6a45e79836455f5283
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection 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://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/11557e4e4e2503f1f77f38520109fa75/92955856438.pdf In PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/mezisabovimesox.pdfIn PDF document text
    • https://stauber.lt/images/files/xupatebogede.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/66293616206.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/71657551274.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/pegelemusalovisa.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/pmj9u2kotpuvb5tt7tfp7rh501/37255498028.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021821112136.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/vurapefepikufaj.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852a5f93158---2691310332.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd8fa9bff9---bewiwogife.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/12218479362.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/71718327067.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/ronoligelugodiwako.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/83024600635.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/51136966586.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/3551043267.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/64855825666.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/9tqcb393ic245nl16a66oegrvg/52474250002.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/712665949.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/mujaxaxunerasiweret.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/sarixiriwabifuxi.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/lazomufeziresozojivutad.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099aa329d6e0---30786763094.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/52700094374.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/31148935351.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/vidoralinexabodijifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=canada+nafta+form+pdfPDF link annotation
    • 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_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 18180 bytes
SHA-256: fa85d49ef0521df543c058374cce324a5ed9622d1dbde49a18b9ed4a6719eb6f
font_01_sfnt_off00012441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C58 10252 bytes
SHA-256: 600854ec9d8c20caa936492b70c1754ac672e9ea4eb33914e3e2b886ffb80ad9

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