Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37dccc9f9fe8b60…

MALICIOUS

PDF

88.5 KB Created: 2021-09-20 14:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd947010aa9b8e5402af91db3ef0c681 SHA-1: 5667fe82ecf9d7677c6961a1639c3343d2dcdad0 SHA-256: b37dccc9f9fe8b602d048c2749e3b6c3cc2de67d1b7a9bc43d6d829bd3318a1b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on potentially compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://globalcenterhotels.com/bot/ckfinder/uf/files/13764395294.pdf In PDF document text
    • http://thietbiotoviet.com/Images_upload/files/44229771541.pdfIn PDF document text
    • http://jainfarms.com/uploads/56822573800.pdfIn PDF document text
    • http://ed-union05.ru/files/file/11209541668.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/dolexipoz.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c930b4df5---34868299660.pdfIn PDF document text
    • http://wernitznigg.at/files/gisinuwuxetogadigi.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/nuwumozepot.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/91707326994.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/85513294795.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcaae6b023---dogiko.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/nuxexugubugore.pdfIn PDF document text
    • http://lex.tj/img/file/wibovajebokezijo.pdfIn PDF document text
    • https://nexusmediation.nl/files/14329029374.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/setuj.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/puvexitute.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137e43ea779e---46645276139.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/ximazuwedefetexavaz.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/doromuburomurafifuz.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/giletulogipig.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/55820873485.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16147f3caea63a---pojedajaxatuvejulo.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/lonumor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+install+os+on+android+phonePDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/28571669424.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_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 10568 bytes
SHA-256: 22a6b052cfe30701232bcadeab51ff694f3ee6dd8a9c62798051dcc7cacb9a68
font_01_sfnt_off00010cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 18076 bytes
SHA-256: bcd400f3c8080f5555f05cdcf030075c2327af59058ad193eed8f90e3fef2948
font_02_sfnt_off00013c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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