Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2cf305b9316205…

MALICIOUS

PDF

69.3 KB Created: 2021-09-19 13:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02d8445f919254b61cbafb24e28cd44f SHA-1: a46deb6d735ee1a843a2f5aa6bb9885f00c80f14 SHA-256: eb2cf305b93162056ee49e02cb176816a6faead744ac422ecbed182a97340bcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including a link farm hosted on compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JS points to T1059.007, and the nature of the links suggests a spearphishing attachment vector (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.masozilina.sk/ckfinder/userfiles/files/potutakop.pdf In PDF document text
    • http://newcityhk.com/userfiles/40220734636.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/gofibiwiluxutof.pdfIn PDF document text
    • https://toocapen.com/files/jituvo.pdfIn PDF document text
    • http://finchamauto.com/pics/66145314042.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/jivurikapetebivi.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/38348575118.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/luminizukilidikidete.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/18074158403.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/12819041869.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/zabugezema.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/66910795780.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/85379614563.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161321ea95d6c5---66336783045.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/43078259539.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/50417253917.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/zegakatixate.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/junalokewefiwisodexananis.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c81665dff3---19152785597.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/16826191396.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7932af4f9---zizurat.pdfIn PDF document text
    • http://venkateshservices.com/uploads/podiboxup.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/xarawigokeburabejuxepep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=goat+emoji+androidPDF link annotation
    • 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_off0000b4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A2 14212 bytes
SHA-256: ef949bf11ff9fbc023fc08b8c70e6053e991cdeb58461826281e20a80115276e
font_01_sfnt_off0000d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 10364 bytes
SHA-256: 3d5672438baedf58e391e68c6384131c593cbb000b0edca0ead842867931838a
font_02_sfnt_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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