Malicious PDF — malware analysis report

Static analysis result for SHA-256 0128b791093ee3bb…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 11:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 558688a053c3c88ab772775e0801419c SHA-1: b9e436b1a344c96e85511a17ed3c122c045f1555 SHA-256: 0128b791093ee3bb96729904aa3e180287b9e6e81cfaad6a2d56b2c370b07655
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=tagalog+torrent+sites PDF link annotation
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0389bbbd---vedufujasagon.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/44686198762.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/moxekorulotaw.pdfIn PDF document text
    • https://produse-zilan.ro/files/fibeseborirowegegijutox.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/19025374139.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/lazezisalomemupukuse.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/fubumimudemaxoki.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-15/20210915144505859275.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/2793167573.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/37330658158.pdfIn PDF document text
    • http://showdoimovel.com/files/files/88805880045.pdfIn PDF document text
    • http://identik.hu/editor_up/59660791509.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2qtdblj78tcbacgkoj3e7kseb5/sidelafitizokeg.pdfIn PDF document text
    • http://metallpress.info/files/majovofakome.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/11011767769.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/kutojaniwodixebetoravef.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/82379014835.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613748da5b3c5---4142620243.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/17543763450.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/83341240784.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/pirutabejexexi.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/tipibapipoludi.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/33473462397.pdfIn PDF document text
    • https://kmedebiyatgunleri.com/ckfinder/userfiles/files/benojizafonulele.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_off0000b17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17D 16180 bytes
SHA-256: 5b921a2d97e506112a5689b49728a96cbf7cebd56c3ef748c217c764ac431a1c
font_01_sfnt_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 10244 bytes
SHA-256: c0366645dfc1a4c02a978dd5f7b6e764afe274a8d1a27415202dfe7d26a419cb
font_02_sfnt_off0000f1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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