Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c53c1fa45d9a73…

MALICIOUS

PDF

91.4 KB Created: 2021-09-14 13:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 002c1f1173505317a9154df66fb81e0f SHA-1: d33a568ab311d66845c883bda852bd18daa0650b SHA-256: 19c53c1fa45d9a733fd977205b150d6d675f50054f8e36d6ed94f48a0784537d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://elsa-daulte.com/ckfinder/userfiles/files/zetotudulipi.pdf In PDF document text
    • http://poaglasses.com/uploads/files/202109131736519876.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/99666287209.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/kujanojokutitewine.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/13183232525.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/vaguj.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/60572237175.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/71463721855.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/bad768263452b8e10721585414913808/komogizun.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf2164b88d---badopa.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/252576488.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/538868692.pdfIn PDF document text
    • http://analhospital.net/file/files/korasilutosu.pdfIn PDF document text
    • http://meskerjager.nl/media/files/dalewewapip.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/bidinasejakilivoni.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614026b348ca6---didajutamodo.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/77326902820.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/36284528187.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/52672026237.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/nawejipa.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/buxaki.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/nesonazatugikuzudit.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/23072721749.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9f88df4c5---25081522153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=c%C3%A0i+%C4%91%E1%BA%B7t+c%E1%BA%A5u+h%C3%ACnh+3g+mobifone+cho+androidPDF 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_off0000ecb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 12028 bytes
SHA-256: 3b768849929aaad99095d3f0fc4ac4b3d7cdcdfb69d8fb4505131f176b768732
font_01_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 23840 bytes
SHA-256: c828e89860c868eb3d5ef9b40917be87f512bbc89428179506822e308cdf2a6e
font_02_sfnt_off000144f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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