Malicious PDF — malware analysis report

Static analysis result for SHA-256 149acfc54e8938fd…

MALICIOUS

PDF

82.8 KB Created: 2021-08-15 22:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6f08cc1479a3e66781a453eae4bb083 SHA-1: e2f9e384a773cc3856af9ba439b4229fcc7dfbca SHA-256: 149acfc54e8938fd113f897959f0c9a2db4a197395f9db42dc470f2594d64216
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to download and execute malicious payloads. It also features a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads, indicating a potential phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://shopgraeagle.com/ckeditor/uploads/files/91579751774.pdf In PDF document text
    • http://dioceseofniranam.org/userfiles/file/sufekuvemuv.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/zakemaxiburipedu.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/wazuber.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/18888392142.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6dbb57a73db8d0e044170a3a22ee2c9/keletovozosa.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cdf3e7cfc---pezotudug.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607215fa9cbbf---robelusevapiwor.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3ce59bb640f0f17a38d3cbcadbfef92a/fikatagibobefixo.pdfIn PDF document text
    • https://totounited.com/contents//files/jotoperelezejirepat.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/14f0dcce4bd7b44d757a63b36aeed5c0/devolasifatufosakapurube.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608832f0ca4c6---48731903120.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609219fb33267---rabomowosakamenotilavaru.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/74361474953.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/ziveli.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/tamodututupoxajemul.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/rowaboraxabosu.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/dofujoba.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/79449863972.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/polakiluwepifuniti.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609b20c45b82a---14780903117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=descargar+libros+de+joel+osteen+en+espa%C3%B1ol+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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 11272 bytes
SHA-256: c2cb3277a8a0ee404979f8f089257f3640b2c456bd752d79e704b5b246631fda
font_01_sfnt_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 18724 bytes
SHA-256: 6e45e9f9f253fc400cd8bb139815926c53570aced58ff2502e508ea915680bcc
font_02_sfnt_off000121f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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