Malicious PDF — malware analysis report

Static analysis result for SHA-256 4faecedd99d74042…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 10:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 111e5ea6add060970536c2dfcfb7bbdc SHA-1: badd88497491c1d0b6c8052c37b9da48f0d7b53f SHA-256: 4faecedd99d74042e1eacd7c24e250fb357b3c754cf768b3a5ad997371faa51c
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the exploitation of PDF vulnerabilities to execute further malicious actions.

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 https://pistant.ru/uplcv?utm_term=billion+trillion+zillion PDF link annotation
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0b2b62515---31915766796.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/42338146090.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/95847786929.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/91138307824.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/tiboresodawowobupokew.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/44446888821.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/14832519332.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210908100509.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/77799504796.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fafcf0af0---kogejamikegitomeran.pdfIn PDF document text
    • http://artediapharma.com/upload/files/titejivavelewesubimaf.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/3880244224.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/devozefududimesugiv.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/genodologabisamitugusudu.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/47384552664.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/popijolomak.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/81732177337.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/jopelusinaj.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/76942593890.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/kodesiguxepikodabusi.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/68076573849.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/laxuminonamugiviluxokipi.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/14044422537.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147637fd199e---38044667646.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_off0000cedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDB 18308 bytes
SHA-256: 6dd8e906f7f8161133db9f84061a2a75964449ccff8d8d3d080fd35862cb8cb5
font_01_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 9752 bytes
SHA-256: 19a3135075b8046b7088855289292b9590c215b07f0911660d844e30a06044e3
font_02_sfnt_off0001132d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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