Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53b3512d5879bed…

MALICIOUS

PDF

81.4 KB Created: 2021-10-07 21:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a7bc9e493c3eee155314e00cac0c8f42 SHA-1: e93002226be0588e7875c84b1d8fdec4c8e6954c SHA-256: c53b3512d5879bedc38ad6c551a6138aa0ab89302e1315f5d748029fbdf8bba2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised CMS uploads or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/63553855179.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140652e06278---52016417049.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/31235581919.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6a29c9f9f---wagatewu.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/66308749155.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/radiruwinomadegi.pdfIn PDF document text
    • https://hinaweb.com/upload/file/72456254131.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/gedudavugagipijudij.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/nutiwebikuwojow.pdfIn PDF document text
    • https://gemwares.artchy.com/userfiles/file/baxulanafitupatavo.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1vgqme88urj6tcth3fl9f3er4s/98610771895.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/60791506396.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/31994040940.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/f4ukgikm50tqb6v52of2aqa9hp/32818020935.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/kividuxuri.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/gekevusonikawuxiboronaw.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/rumawebirewugigivabufu.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/fimepuxumebuz.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/61375039385.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/49117749350.pdfIn PDF document text
    • https://citytrafik.nu/images/file/zupenarudatobot.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/20174103998.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/potikukadodatakolirowojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=against+humanity+onlinePDF 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_off0000da3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3A 10652 bytes
SHA-256: 2baddd02a31690866e8cf78c26ef01cf350fbc21360564d24a7c2dad6b478b84
font_01_sfnt_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 17936 bytes
SHA-256: a734ee66e1dcbdeea804fdb63cd366f703dd44c4cb615577154a67db06fb704b