Malicious PDF — malware analysis report

Static analysis result for SHA-256 113d3aa6c613e518…

MALICIOUS

PDF

68.8 KB Created: 2021-09-09 17:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae0a454936afc93222c9efa0a7b75144 SHA-1: 3a7788d8ad38897a9cb3ccb929bfb72b777b8010 SHA-256: 113d3aa6c613e518b7ff0c68ccb3d811d93dd42fbe41cbab7d6f883bd57f3298
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 or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=anime+world+apk PDF link annotation
    • http://lycee-elm.org/userfiles/file/vagodizewibavexomowuki.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/642192661.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/50156733625.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090917284473499.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/17532762546.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/57947682333.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/karoduvutipaju.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/88927025133.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/fitup.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/ketoxurudep.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/69151179377.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/32599210312.pdfIn PDF document text
    • http://dothi.info/images/files/94899551793.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/gilavupiwu.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/boludetotikafutatodezaw.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/loxasofod.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613864436bb08---81872656937.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a176669c---65917644399.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/93220537151.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/sikim.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/3774469693.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/rozufovamopowigosomo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f9573382b---bevozezilizod.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/gukajulil.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_off0000b21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21B 14396 bytes
SHA-256: 02fbfcf25489fa174f02986238e3254758e34844f4d1bb04659606fc4c96a455
font_01_sfnt_off0000d5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 10444 bytes
SHA-256: 01130ffbf9fac665bffd5300473801e9827ae58fb615cc9094d87992af031ecb

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