Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d4056593aa3ea7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-14 04:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5adf6c850ff8af87c60f879e6421ea07 SHA-1: 8f68d32b6acb53f211281a9c8130dfd93b4d5e19 SHA-256: 53d4056593aa3ea783cac1396d26d75afea3db66a9ce7042e9ffb51591253a64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=changing+sd+card+in+phone PDF link annotation
    • http://deepakbatteries.com/uploads/file/38120887227.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a922058c8---buzuxejexulanategasafu.pdfIn PDF document text
    • https://vzglavniki.net/data/file/fatabujes.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f899f5d7485f6a2255149e8b81ea82c6/bekukimaguwumofobeserives.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17030996021.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/jaxotexagusuzubepipiri.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/15544312002.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/pokimu.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/25859956441.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/l8g5jt2g4l525t539ssnkb568j/15434012729.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/jusefiba.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/42716418807.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613a858070cf7---vuvozos.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/kiwomusazeratadasejulagex.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/12043866886.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/susaburedekapowi.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/69694795604.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/66895868430.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/pemalanuzawitikuriranek.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/724845668.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/papuvibofojijef.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/matibovexupefugo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/29646982119.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_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 18136 bytes
SHA-256: c377e8e67aa4730eee8c8d775c01a6a432951d246af1dfcf672c936bdc540f8b
font_01_sfnt_off00010f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 10680 bytes
SHA-256: 0c50d0207711fc953fd0c0baa21636a351407ddd2e0054c467d7730853d8e3a8
font_02_sfnt_off000127aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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