Malicious PDF — malware analysis report

Static analysis result for SHA-256 d213e633ea2dcfb4…

MALICIOUS

PDF

73.2 KB Created: 2021-09-24 14:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2c5832221e3010bc8650a1668ec84b26 SHA-1: 3babbdfd4fc339f3f257bdc88f0aff7cb97a296b SHA-256: d213e633ea2dcfb48f0af95862222c7d4ea86bdb5fd46c38a6eacccedd8351de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, including one disguised as a Windows update. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=windows+10+20h2+cumulative+update PDF link annotation
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d9302c3d1---85556053597.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/garosidawuzefu.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/tuwokosukov.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/51785701985.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/bozevudutedagar.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210920050732_4ovtzk.pdfIn PDF document text
    • http://newworldss.com/uploads/file/gebotefes.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/58629487418.pdfIn PDF document text
    • https://triosms.com/userfiles/file/85700329615.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/83307648940.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/benisif.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614803b22b945---toxarimetesobawadonalago.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/jukenu.pdfIn PDF document text
    • https://ka-base.no/images_content/file/wuwelav.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/3bfe7bq3peffqu4heqi0ic1eq6/nepepusidoxabaduw.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/37025645093.pdfIn PDF document text
    • http://ippon.lv/uploads/File/madefapuseguxagakakura.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/wejuwukirapixuduxedi.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/75574373955.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090315002960.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/74650415622.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614db11cede2d---77672184574.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/53499955320.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_off0000b5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A5 18356 bytes
SHA-256: d329e9a6f26296bbf7e40bcb72190b612dc541a45f33305a519e1ecd83b76c22
font_01_sfnt_off0000e4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 11220 bytes
SHA-256: 939c160a97509d93d61d9f96b3f018c32625d53aa4780fbc72ca6bb8bab68a98

Open this report in the interactive analyzer, or submit your own file for analysis.