Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c91c4d78940a99…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 03:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f1c04205bbffd2748fa504e3a1d0581f SHA-1: 3b5ae9e63beedc54955bced0b3cb529f5ccede53 SHA-256: 24c91c4d78940a995020e36f7707c05159a03b5cbc243625950dc60751c77808
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaca7e8473---zokijinapumejezito.pdf In PDF document text
    • http://www.allatpatikapecs.hu/images/file/tugevekevene.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/dc96d3e11504e9dcb253e15b5379652f/narotenemobewegi.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/lefodav.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/24610565113.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5a814681a---lufadosawerarobim.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160db8a63e9639---20483070613.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21767394998.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/zafitobenuguvubuvixijisod.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/36844061633.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/14818940223.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/92053262502.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/kutapudowojirovurudo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a7d097b4d---52045047701.pdfIn PDF document text
    • http://seamacros.com/upload/file/wemefaruso.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609435f9da520---mezumixufirix.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/63271679729.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/12101939755.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/wugilesizixogivonabid.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/nidilepa.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16071e543690cb---litaka.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/govarowekazumoke.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e81c4346e66---jowegedudebukolovopale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=difference+between+ledger+and+journal+pdfPDF 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_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 16532 bytes
SHA-256: 16f210b17e91f888fec356b6cbab2660745e2793f8064f6fc7ea8dd249283db5
font_02_sfnt_off000117f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F2 11084 bytes
SHA-256: 458b4bf68259615608a0f5bc9b6f2f83711a6354eacd6f005ed6ab41f1648ef3

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