Malicious PDF — malware analysis report

Static analysis result for SHA-256 9955508079cdb28f…

MALICIOUS

PDF

81.3 KB Created: 2021-06-29 22:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4c74e3b080d9a6d410f78eaad7c9611f SHA-1: e9a83109693064bcd42774e64560bab93b6ea4f2 SHA-256: 9955508079cdb28f40b964c2090f622186eac80e7ec9088614f51aa5c00b8646
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The presence of multiple unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://topoint.cc/userfiles/fckFile/20210618190252.pdf In PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/8d8a286eed2e50442d76bb0ae792055c/taketavejovifetutapudod.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/l07fm7vorssag5egpsrdsj4vgs/degugugukebopedufewigefo.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210610005512.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/mewekepoka.pdfIn PDF document text
    • https://senfina.top/uploads/files/74300701665.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/021e844ca2aee90b912e07dbff33550d/81737819359.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0777b5044---24668663802.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c632e877cb2---59701972654.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/15d2a6dc5563b000a0e37d6007538d6e/56980102780.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b4b5dec52---tosalenoxarofugokorafa.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f89490660---23064431936.pdfIn PDF document text
    • http://kotolantopeni.cz/file/lowel.pdfIn PDF document text
    • https://actorconseil.com/files/file/vaxaniziwopavulafikalapar.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/gozubofofizoxokenu.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e2bb8e3d96173e35ec219a0fd7a69792/13988738797.pdfIn PDF document text
    • http://zxsolar.com/d/files/woxezukutirow.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/liguvemolukeg.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/dawavesitanonesas.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/7ed4cde77fa9b47a5c484b1e639b35cd/68211923691.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/41462412328.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3341d2bb2cf1dfc6aba9f53e5c8bb3b8/bilujanolilonepi.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/tewebij.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09dfdbf44---jotod.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/73679316967.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca30453056d---mugikunetaxanedin.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9380542f67---lojaropazexevizudiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=symbiote+spiderman+drawingPDF 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_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 16964 bytes
SHA-256: 6c0e6abf45ef38f45cce7504904fa943f78e165e75090f8fcc3bab498bdbcca6
font_02_sfnt_off00011e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4B 11104 bytes
SHA-256: 75befe8d41d07d77804bf94d6a12d462bbaf9f2eb6966a67bf9c7a17d705596b