Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca39afc1f8b2da77…

MALICIOUS

PDF

73.0 KB Created: 2021-09-08 14:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3c900f4a12296f4cfe2a291e93b884d SHA-1: 6a01a46c5bbc867ebc0985e7b271258d71c75109 SHA-256: ca39afc1f8b2da77e3791b2a67bee3713716dec090cc6fb54a88684c99579fc9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute phishing content or malware. The presence of embedded JavaScript indicates potential for client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eca6a4120---13289782295.pdf In PDF document text
    • http://farmina.ru/uploads/files/19361501718.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/75539110770.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/kunaxesitakufobe.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/59416277751.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021962334167910.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vudovuli.pdfIn PDF document text
    • http://orem.mn/uploads/files/97519770652.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134f91fb459d---69956149108.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/41526586304.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/segukag.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/vemekaduletituvunozite.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161378c04a9524---1187178217.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/pidavasotegafobi.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/77609630334.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/togidexeverigom.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/setuwisatavudadoperozuti.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/14413593942.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/femusifuli.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/73307164419.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/159b087184bb889ac8bf835e0b62eddc/80221833439.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/66334366999.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/kebutixexofasifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=poulan+pro+bvm200fe+parts+manualPDF 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_off0000b877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB877 10976 bytes
SHA-256: b021e00e41e266be20fc0e370d12bf04a01ef44fcbc46445f7e447177583c365
font_01_sfnt_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E7 17016 bytes
SHA-256: 37b4c084164a3c2e1d10dec081e1ec55fbd2a78a2960b4a64b5603daa70b8a96

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