Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf1098a7c5b06ca…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 13:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 00f4be6df4eeb542eb8dd78825088d4f SHA-1: ea9d5bbf88a3149f5dbd16319a3fd3bdd16a2bfd SHA-256: eaf1098a7c5b06ca471cf270daedff55e093a6fab3f6bff60ab83c78db0ec9dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://nomylo.ru/uplcv?utm_term=sports+management+system+project+pdf PDF link annotation
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26ffd75771---nonagagasigiraxinakitifaj.pdfIn PDF document text
    • http://skomi.ru/img/files/file/36902953740.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/fc87577ef4cbd4452d687c593a406514/59810918975.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/80070849648.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/gafagubaxuruxitugunaxan.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d1cc294a4e---rikuxibafaxesu.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/wuzoguwoxalekotujivuxa.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/javogukov.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/tisap.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3593aaf3d2---xedajegefekejudaxotidoka.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a3c670a9c---74335642066.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/7e3b81d97d4dd22ef25647028af35acc/65550834245.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/91820123075.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/repaxisarawovoditi.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9b4a2000b9b1f7f4f1ddd47ee9ed5a33/bumativotik.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ptl2d166hpu22jqgv36ouhir9g/vozedolunik.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/8309061930.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b63583a1c0---79898713524.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/49210136583.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/358cc7d5c32f7b8b4a695f9875437eba/rizofufe.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/zafolarobu.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/a6a7f7aca7abcab98b23e7952eed6476/98853343304.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14582fcfb---fovekafeziwujibebuxat.pdfIn PDF document text
    • https://limmaginebistrot.com/file/44794717067.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/62786325445.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/qcq1uum7qbc2vcem7f9086mh14/77161234723.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdbe2ab11c---16664791194.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_off0000d5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D0 16816 bytes
SHA-256: e66b44b0275761c4f323473f5beb589adf4da4021d97eb67eace584c6c2a3e55
font_01_sfnt_off000100bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 11144 bytes
SHA-256: 7977b546254c9f6a3f2cdb382d4464f601e35d9aaabd5245334acfa04571e472

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