Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a51321cd03935c…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 05:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 32eb5a124927981f6bf2d4a9df9a76fb SHA-1: 489ad55887d3a74e62d7b4f3c39dd3396e2dbb92 SHA-256: e8a51321cd03935cfceb49f750b1ed6208c30603dc47f8f0bd6158e5ff4c7002
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://netlandschool.cl/files/5557290772.pdf In PDF document text
    • https://reitinguok.lt/userfiles/file/10944267099.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/jukujadamabelag.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/42b427440b4da053350c7ad762e4b93c/26358897415.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/01e17ns3fk48g6d6fsl81buq50/fozatulobulaz.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///vikalimotumel.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b571227ec---9409598391.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/jozelebisixakux.pdfIn PDF document text
    • http://fygl.net/uploads/file/180617401253.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/78fij0s6hchhviqicn3odfr1p2/68127130768.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/70116893003.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607179db4a71c---tuzawepefuzidodesekibeto.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/99183960168.pdfIn PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/firosojumokumado.pdfIn PDF document text
    • http://isvpro.com/custom/files/jadexekowobejerefujodisu.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9825322511---lopajevesuburilivogi.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/logolazuvenijo.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/71613749852.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/vugojilijozig.pdfIn PDF document text
    • http://ippon.lv/uploads/File/webubofalelaguwitagulo.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/zanopobewezapuxozosemo.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/misivutoz.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/17162962778.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/83276720829.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kejonobexoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=othello+novel+pdf+free+downloadPDF 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_off0000c587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC587 10512 bytes
SHA-256: fb86aa4b9b608e6db754edfc97590d403c75a2bedc424a95595569db22a645ad
font_01_sfnt_off0000dd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 19728 bytes
SHA-256: d2958ca9361988645ba6e336dbe2fe70eaf3d9487c016aa1beb41196c1f96236
font_02_sfnt_off00010ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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