Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac19470fd482e31…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 14:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1bfd511d0955dff03b1328c48aaed51 SHA-1: ec5eef1bf587ede7e39bd164e165f5ccf1798aca SHA-256: dac19470fd482e3150920b430805552717d63b9f62dc0289ddd0487055e5e476
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to lure users to malicious content or download additional payloads. The presence of embedded JavaScript indicates a potential for further malicious execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=sherlock+holmes+sinhala+books+read+online PDF link annotation
    • https://westhigienia.hu/editor_up/pujokavepagonaz.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612eacc9cfa65---74151756608.pdfPDF link annotation
    • http://dwornawodzie.pl/userfiles/file/pidupotatofar.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/53459812009.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/jasonujewusolelobededar.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/74619215325.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/42936161504.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/pefizineketonezawijoliwo.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/ridifoniboxepiwep.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/vekidalukegenibazajano.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbe97b700c---33538788800.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/difoge.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6f40b0304---vazidam.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7923850a---30776699019.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/kemebabiritar.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136479e34936---88460824839.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/19514439007.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210901_9085DFE5F6ABD407.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/zowidunazupowatabekuviwob.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/23130864218.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/28288542280.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/raxagegixe.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/27541649863.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_off0000ce39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE39 10844 bytes
SHA-256: d4dae0b3431e0fd333b7e61be153ab91c58f44709e9d0dec269e2da0f4026eb9
font_01_sfnt_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 16836 bytes
SHA-256: 573e9e8c839b20ea8bcc4c94448d5fea84d0b5db9247aa8289ff501802cae9c5