Malicious PDF — malware analysis report

Static analysis result for SHA-256 899dead9e852706e…

MALICIOUS

PDF

85.6 KB Created: 2021-08-04 20:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 22882c72c4638255cf02ab6c02c6d37c SHA-1: 17e75897b4df77ce597648dce0cace1867f37e48 SHA-256: 899dead9e852706e6eab84c91bcbde2766327ea3d998239310a0ceff690dd4ae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://acrgroup.nl/userfiles/file/38800198638.pdf In PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b968d34c830---tewaribaz.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c57a4d07fff---dorunewok.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/lufemuban.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee524624a6---6433517991.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/26707700519.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/tipoduguwefaromukusez.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f60eaeb826a---54606031051.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/52273060841.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/58971102526.pdfIn PDF document text
    • https://anfauglir.com/images/file/lafixojevenitoxuvot.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/4222952155.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711a6bbb62a---6961346538.pdfIn PDF document text
    • http://marymo.ru/uploads/files/10721929003.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/3ohb3n8sa4ca17aef7erd36d91/66265898380.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/parasuwuxerolerazepe.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083970d197ec---bufosidawakivawi.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/21823075849.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vikixesiziwanavuwuwedi.pdfIn PDF document text
    • https://lecapsuledigian.it/file/lefajebozogoko.pdfIn PDF document text
    • https://marigabung.com/contents//files/wulitaxaxagowositafu.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/pafogaresololujesibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=stick+warfare+blood+strike+reward+codes+2020PDF 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_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 17248 bytes
SHA-256: 024d3d458b667240b3b8a62d55453318ac6ed632fbafbb7953761b6b2f2116de
font_02_sfnt_off00012f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F58 11000 bytes
SHA-256: 45ce6159592ea356ccbd8b8a5ba374e7f133b8d47a919d184e28f12454a6e8f0

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