Malicious PDF — malware analysis report

Static analysis result for SHA-256 38940455db0d9178…

MALICIOUS

PDF

97.9 KB Created: 2021-08-08 16:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: beaa5f535235cc1468a798df0367b9a3 SHA-1: b2a87665c021c34b9ae253a5a8a5d9667a056d93 SHA-256: 38940455db0d917834b322b966d8b000f3a0f9e967970d36a1d92098b46f74bb
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The presence of a "download button" heuristic further supports the intent to trick users into downloading a payload. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=modroid+netflix+apk PDF link annotation
    • http://gilendor.cz/userfiles/file/621121338.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210624161757.pdfIn PDF document text
    • http://asustainable.com/global/file/bepotawimitelimad.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608386a0af2e3---75477925330.pdfIn PDF document text
    • https://atrax.hr/files/kuxufepar.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/nebijukafuzusipuvuw.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/63931522277.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607adc2fb31cf---bejapobipiwa.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a1dde7648---31875001995.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210731_154703.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/aebfcf2ce61d66f0f2c42be85d806d9d/75539881596.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/73064426380.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb1425c3e---84944705613.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16102b4c8b44a6---97501895670.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6b9c8c8bc---74745626294.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8184d6c8a3---54858845703.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f2c5b91eaf4640606318eb8866e1dfee/99527282588.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/gosiwudesuwemetutevodes.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jegaka1d6ea23vb4cu3i1mfitk/tabipa.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d58e2e44f9---27403422939.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b76bc0fc11---3451285633.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/70076926702.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/302259087125.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/23597b46284c10cc78a43bd9b740829d/61616373712.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB6 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off000130bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BD 17968 bytes
SHA-256: 52f2918ad30831d429151500c4afcce396c9d3f75ec06f83f528c4bcb03f373a
font_03_sfnt_off00016020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16020 10512 bytes
SHA-256: dee804cafffb10ee70dc885ac9f062b7ea4f58159406cc884d744c98754d66a8

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