Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafb67ee62a5247f…

MALICIOUS

PDF

98.9 KB Created: 2021-08-03 08:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ca99469f6d7027fd9ee5f800e9137384 SHA-1: 531703fc38c3716a70fa85c14fa2ff12e0fd4ea9 SHA-256: eafb67ee62a5247fdb3359feacad87f1fc03069aa6241d55ebe663cd85dcac0f
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic findings point to a pattern of hosting malicious content on disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://coretry.ru/uplcv?utm_term=exercice+physique+chimie+5%C3%A8me+les+m%C3%A9langes PDF link annotation
    • https://tramhuonghanoi.vn/upload/files/63167234514.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1ep2krpnr2vhsbrn8reisouoq1/5003688234.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/46756204604.pdfIn PDF document text
    • https://sce.tw/uploads/files/6107b1cc63587.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/a9pj3t7djv1c6qpgc204fjrh0i/dotuzi.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6a9fec2c7ec55f3c51dcc1d83ff2746b/zafufozaxuforoderolewin.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/40828470829.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e0689dd6d0c331779ccc1d75d937c521/32818051718.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d60ec9c36e7---jejunavojufujim.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b583d1a19---nipanopajasajez.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd59847336---vewokibifo.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/laponawusidar.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/a1d28jjeou7a65e305jobslgsj/95333230689.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/64203856265.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/l037548209jdfotv1mjd29ilte/piwofisowo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd139803e---daxavebevibajudadulupumuw.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078991a64460---godimerirotanewu.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/pivulidegibezaz.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/35588085434.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b1b8ac23---9450715050.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/7f0c7895e9cd2e104997fe7318d95fb9/87583264510.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c5e6784b87aa1cab3f1227e321ae50f8/tazemuro.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/bozepexavemonutix.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/40323584832.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776ca1110e2---wemevepoxenizan.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/65474003710.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_off000117b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC6 20168 bytes
SHA-256: 785043fea0cd3706d86ab590e949b938e5d718c6d8800791938caedef502e18a
font_02_sfnt_off00016109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16109 11492 bytes
SHA-256: f393a1e0559cd0accef2dda737b348d407396cb4c15a854685e4c7fb29debd47

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