Malicious PDF — malware analysis report

Static analysis result for SHA-256 214bd882f7b2a45e…

MALICIOUS

PDF

76.8 KB Created: 2021-09-15 20:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d1f8d3350889b02d7a72b16adb97f02 SHA-1: 4baf760d0296672350f1c497124c002d895dc695 SHA-256: 214bd882f7b2a45e57fe8c36057dc40979fec26ad0ad8b137f8fbd62d64073d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=carrom+apk+mod+download PDF link annotation
    • http://ohsongpharm.com/ckfinder/userfiles/files/41147534176.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/8052901133.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210913033018818.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/nogajepi.pdfIn PDF document text
    • https://ysh.my/userfiles/file/61571992963.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/94580082298.pdfIn PDF document text
    • http://chemsdano.com/upload/files/fetako.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/xuvumufegukalukaji.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/ralokerisusizobidi.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/zufodamelilonene.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/vejitupower.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/0de8759ddb5064e2bd8a8957985f3209/kubotasafagilusofogawumuk.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/47678894936.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/90994859859.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/81957616973.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/62708614079.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4813fcf792451d8a00dab4d591cd4dc/91882681983.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130797c8e51a---wolenate.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/95809929536.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/68996027659.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/65093230468.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b26e20478---51972556577.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/95757702761.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_off0000cc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC41 16504 bytes
SHA-256: c741bc6204e1af81e110f76c2ffbc536589c97e8a2c48ef15c04452f1895236d
font_01_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 10272 bytes
SHA-256: b07f6eeb3a539d7d3ffd73270eeabd57f028b5ab6c49ec729ddefbfa79b6a473
font_02_sfnt_off00010dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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