Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ce8bd9873e6624…

MALICIOUS

PDF

115.5 KB Created: 2021-08-12 18:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 44855f597baeb29d95c5eb8b8f8a33a2 SHA-1: 77e393e6c6af6564eaf0b31a1ff0a67728b6d5cc SHA-256: e6ce8bd9873e66248dad09943daa738a90f080dfa0056785942a762f9ed79e4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=how+to+save+your+relationship+in+30+seconds PDF link annotation
    • https://myclubowners.com/userfiles/files/58507469515.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a17a15c8d64---30929504811.pdfIn PDF document text
    • http://bociany.sk/media/file/55312284136.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc7040de1---91738164001.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc7gs2oof6fj3eo89f040l7mj0/41296909670.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/ae2d837f9e727ed027684653caf6a921/7112445612.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1fb7d32f01e66c60147dfe1486376985/nivegonojotatamimokajufe.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/5118830316.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/denawijo.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/45929259493.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/45124561008.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa349b3fd65---33199836226.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/nigunedotukuzi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c99a707e5---nalibixotufefuxemozilu.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/56193339194.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f04fe9c795c459e264ae1de06ccb488d/faxufetinutexog.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/75054072324.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9ac17ebdc756ffc1c03f4f9a1bfe16ef/58472936902.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608132962b730---56142263661.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/mitubonofuvexonolulo.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/1445026cc4a6e419cc10b69b3b0589c1/xanamoju.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7sem22i078h7k225l8o8vrnmk4/wonazovifuxubafotapeg.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/11427687051.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/vukubikemiti.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_off00015f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F46 17584 bytes
SHA-256: fabdf1e3018b159c89af64e847c07dea1b1320c85b1c7356cf96102c9c7a324e
font_01_sfnt_off00018d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A532 11264 bytes
SHA-256: 9527ffb3b382607f437b49b59345ca56388b8d7e673412c495b3a829db74143f

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