Malicious PDF — malware analysis report

Static analysis result for SHA-256 e557620fcb6d0463…

MALICIOUS

PDF

69.5 KB Created: 2021-09-05 10:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37f2111b9d6c5e4c1011e52c0eefd97e SHA-1: d1ebd14710f78009872fb29679eeb13f2b5fef04 SHA-256: e557620fcb6d046366480fcaee77dc63d34db59286ee69f9ab38c53b21969212
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=all+body+systems+pdf PDF link annotation
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/22068213655.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b64d49a2a19---83991118945.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a300c1136f9---zuzaludojudobosusefagix.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/2487335b57d7de5a3bb096cb85e77080/xakebiwekesotuteronu.pdfIn PDF document text
    • http://byecook.com/ckupload/files/nideregonifiduvodokikegi.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf907e1e642---nigamawazob.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4c35eaf0c---tozizo.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/94614331173.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/11578436162.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/1ded7b4aaa36a8c159e9b54efb408cbd/kaxubenujurawulixaruko.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/85824948482.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/vizikixejokurokiv.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/74753569176.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/dozubiwutebeta.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/21110179810.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/pakekozok.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/laxusifawig.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745736ed5dd---zoluwim.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/baguxofumegu.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/28083519688.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/75985417300.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/busemavomikokosuno.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/44956087650.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/gepavefowuso.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_off0000b47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8E 14648 bytes
SHA-256: 0a8afa7976d573cb0037a1cd30e09ed228198b283fb15ea252ca5c57c7f4b579
font_02_sfnt_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 10436 bytes
SHA-256: a85c9acf8c8f2b941d0e61884a12b06eb350f8b40851fa62056b5d7e17348936

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