Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dcece3fe4d46cc3…

MALICIOUS

PDF

76.9 KB Created: 2021-09-27 01:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2ea74f55377076fad731e5f5e3565164 SHA-1: 95b3b8aa2af4b501fd9a343ddb8d358e6d8cbe19 SHA-256: 2dcece3fe4d46cc35b4eb58926db221f92c814e1d6384b65bd1facc4393cdbcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and a machine learning classifier, with critical heuristics indicating a compromised CMS upload link farm and a link farm on disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user. The numerous external URLs, many pointing to PDF files on potentially compromised or disposable domains, indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=how+to+see+profile+visits+in+instagram PDF link annotation
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161424ec6bee96---54552457597.pdfIn PDF document text
    • https://reniuved.it/file/92326866790.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/nugimorepijuvagukakoramel.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/11079074278.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/80588702711.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210909_54F0B6FDDF3AE9E0.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/56474851987.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/93069226286.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449bbfe6129---nuxowazagekasut.pdfIn PDF document text
    • http://talesma.com/E/file/61825458346.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/1346018487.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210927_002457_4179.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210921012521.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/99630939430.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/jabovaduvakakalanija.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/11280727218.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/tifudavoki.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/8274871348.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/65287210772.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/kazeximexuturesojevafe.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9a31a8b22---nixewexoze.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/pisimetekefu.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/kazulamino.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_off0000c425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC425 10844 bytes
SHA-256: ac257c3c03ce65ca58d04f6b8025c4a862d896fefb7165f2d68670113203d88f
font_01_sfnt_off0000dd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 18756 bytes
SHA-256: f9919a8e385edac951964a3066a1955eed5651a1d38b470fd92e88d2daafc59f

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