Malicious PDF — malware analysis report

Static analysis result for SHA-256 28795f7274ee1a14…

MALICIOUS

PDF

86.3 KB Created: 2021-09-23 07:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 443d64fd59c51e73caad80c7774940e6 SHA-1: bb4038dce5d65f8b03acff07503c270be35f6ec4 SHA-256: 28795f7274ee1a14453f01311f4ce8b63239a21e02960fe7bfd4b0499878ec80
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=street+football+games+for+android PDF link annotation
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/7c0ua2cseeccddet5a7hb7o6vl/1259423475.pdfIn PDF document text
    • http://topstec.com/d/files/60330421329.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/3245022763.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/29471770583.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/24868174129.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/manunusubobepikira.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/powajugavike.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/wotuvidemuw.pdfIn PDF document text
    • http://zaiger.ru/img/file/85469323659.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480c1fb5a87---55785334577.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/lerar.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210923_045137.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/6716464773.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16140aa8f2b5bf---papajibotipamun.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109132034385266.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/88403848424.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0f09d52c7c258731760ea163a54a05c5/dotujulajita.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/vapamasaxinubomitabujafu.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/rigelozosuruforotem.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/fetezoxu.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/1953701961.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/wolajuwipovenuvo.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/34035122111.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/24077817910.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/75953284626.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_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 16868 bytes
SHA-256: c6f5ce25a491ef8d314dadcdb9e9367bcd9006e3ecacdb65b47fee737e67f89b
font_01_sfnt_off000119cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E6 10912 bytes
SHA-256: 89affe2cff20d493a36f0e18d65863022b9e254608f5eae601fd23cd5e9f08e9