Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ff55122d130a60…

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 16:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c4ba3fcc5420fc943cfd49a4284d1e6 SHA-1: 8c517f2d78249f7a278d739860dfb17abc9edb9d SHA-256: b3ff55122d130a60c59df116af730766cf4624d358c2db8424d99b8f625bdf3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://www.sas.edu.mn/ckfinder/userfiles/files/depixakodekukapetiruzidum.pdf In PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f7225da6dbb6b350b1dcbd9a5b8a24cf/81629865757.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/48070249383.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/34c61ec118d573dfd5c072f4e21ff9c0/50043879251.pdfIn PDF document text
    • https://thietbigas.net/media/files/73692671785.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/puxoselijiboragilugek.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/35131109786.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/refewimixofamokumu.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/64522578752.pdfIn PDF document text
    • https://apelhijau.com/contents/files/mitufexediv.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/wubixewisiwibupozodizajaw.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/12600546764.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/kolaxujagoxoxip.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/kuweviledezap.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16134410a2a05b---71286836278.pdfIn PDF document text
    • http://effekt-film.de/files/file/47008733086.pdfIn PDF document text
    • http://domplus.su/userfiles/files/54398276703.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/rusilaxumewomujeto.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/fosozuwefovegif.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/resaluratobifora.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/38675469004.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/mevakuv.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/popajogudajadeboluko.pdfIn PDF document text
    • http://skupka23.ru/upload/m/tedokije.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/vukugorarovun.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/fajufifokoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+change+dns+on+mobile+dataPDF 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_off0000b48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48C 10936 bytes
SHA-256: c2bc2ecb51cc26fa955cae71bcc7d4363252c277ee46f60a5df68b2b3e0394bc
font_01_sfnt_off0000cd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7B 16100 bytes
SHA-256: c5db60c34119161d1e983e8647cf438573016d46cb3f62c74f1ab606a1776c0f
font_02_sfnt_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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