Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8835bdd9e0fc792…

MALICIOUS

PDF

73.7 KB Created: 2021-09-16 03:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d748a7152bc3c2b60f2f0717c2d7416b SHA-1: c32e8c3b75a9dc4b1e0fdfaa8101129283dfad60 SHA-256: b8835bdd9e0fc79211d245b91785840e97b864a2e9c572dddca727cadf5ea3ef
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=modern+physics+resnick+halliday+pdf PDF link annotation
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/tokafigekebilajirimagale.pdfIn PDF document text
    • https://terracell.info/images/file/fozadiverigimurajaxojizi.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/85960142349.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/18182334291.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/20706342869.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/dufopakufilujul.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613eedb80381c---99929514240.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/donetunaxoladagabilotov.pdfIn PDF document text
    • http://aquatherm-graz.at/files/nivijipetogugeseratat.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/nekabixumemo.pdfIn PDF document text
    • http://ihdbd.org/upload/files/fopor.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/jifibafexibapowezikopi.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26776768456.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/puxiwexekupabed.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161338a5c9f106---jetalojarev.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/golawiluxunekeki.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/loxamebewavogelova.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/55923088660.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/87950697371.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/59599442730.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613a78c33d44b---nedugumifisosi.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/zajubopab.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/zewirifegigefele.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/28225129508.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/76862108656.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_off0000be08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61A 16276 bytes
SHA-256: 8a333f54ffc874c2b728657fdaf59d65ac063a080ca31f22e329d9178104d1ec
font_02_sfnt_off00010020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10020 10820 bytes
SHA-256: 980c8cbf93f8fabb1506c76fd3f623a7a6efa85064a40ffaf2a22b589c14c67b

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