Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f2072697e427bf…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 22:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efd397e33755cfb04f9da71d804ad0f7 SHA-1: a63bc719423aa4eb3816e96d8fcd3b8b0130cbb5 SHA-256: 09f2072697e427bf577618fb3f6d15ea16d7dbf2d919269c4c98ff000919ec13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=minecraft+id+and+password+free
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161433aae9b074---miroserewew.pdf
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/26996977836.pdf
    • http://autoscuolavalerio.it/userfiles/files/44771820691.pdf
    • http://www.elstar.ru/uploads/files/dotokopifaxafabisawexelef.pdf
    • https://markyatirim.com/resimler/files/vobukajesipiwu.pdf
    • http://epodhajska.eu/UserFiles/File/28642607665.pdf
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/kupobo.pdf
    • http://kubablimel.pl/Image/files/lexebuniwagefolopexepaf.pdf
    • https://jpt.mysmartedu.com/uploadimages/files/woxuniduteranedeleji.pdf
    • http://marleenjansen.nl/images/uploadfiles/satizudemibupebexa.pdf
    • http://taxfreepoint.com/file/75862373731.pdf
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/jawosow.pdf
    • http://miwon.com.vn/app/webroot/uploads/files/difavanijasatedemi.pdf
    • https://alpinashop.bg/files/48288968201.pdf
    • https://eirai.org/editor/ckfinder/userfiles/files/46836472852.pdf
    • http://freeware-software-download.de/uploads/editor/file/80637850296.pdf
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/78814991421.pdf
    • https://vokalensemble-vocembalo.ch/userfiles/file/17563749345.pdf
    • http://rtm-plus.ru/ckfinder/userfiles/files/37063937174.pdf
    • http://movesearchesuk.com/userfiles/file/84490072580.pdf
    • https://datatech-int.com/userfiles/file/ramuned.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c773ae24b---kopapojamuja.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d58e2cfed5---getibarukatetewalunazeve.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb6e.bin
d6dbf1e1a440a078215315c5de5513436c29ed346cd8386e8b480c6c689d9a18
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6E 18272 bytes
font_01_sfnt_off0000ea89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 16792 bytes
font_02_sfnt_off000102a0.bin
16986fda1ca7b0a20bd8b11d86f232fa3ec5fa06195cdd975a0d2076352c4ab6
pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 10648 bytes