Malicious PDF — malware analysis report

Static analysis result for SHA-256 499b7a8591b43785…

MALICIOUS

PDF

79.2 KB Created: 2021-10-09 01:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 45a807ac82dc0a42d4c0a4569bf878e1 SHA-1: 74e10922126aafbd41c99d51370dd83099eb8bb1 SHA-256: 499b7a8591b437857bb319d93f337bd7ac5970de7229896e453d231ef71dd7ee
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 websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://aptekarynek.pl/zdjecia/fck/file/vikumakirulexar.pdf In PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161561d9fd3b45---pasek.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/20578123029.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/86240576672.pdfIn PDF document text
    • http://mextro.de/upload/files/lerizuzemakazokasitig.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/l08ovf0r5q2fme1o48073opna0/12572455014.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/88072679345.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/33746010561.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/bowawidesuzubad.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/4548674078.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/2217221142.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15832852295.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/99295869181.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f71ffb86a4---29429525705.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/kepolimax.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/nilexilufunitozuve.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/30465730465.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/xevorozupaxekefuwipex.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/38078965846.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/19513688731.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/tivabadenoxitibisaridepul.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9cf3f021f---sogapibewudirifaxomimo.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/14315748583.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/wemikepopum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=geography+10th+class+bookPDF 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_off0000ce9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 18348 bytes
SHA-256: b1b9a3c51b6b692036c587a34bcb8a21aedc3bc30d00f933c00c9bcca76f5852
font_02_sfnt_off000115db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DB 11016 bytes
SHA-256: b2b3c1ece85735fd6edd5cc0a50d848471a603e9fa54438a8991df10c31f696a

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