Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ff1a85d4cd8166…

MALICIOUS

PDF

72.8 KB Created: 2021-09-09 20:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef3b73a56e426c853044107fce869848 SHA-1: 2ce5ba15e0d8bf378e6f87015d05d1722529e2b9 SHA-256: 93ff1a85d4cd816658f1a43366bc015b9780ef0531bc8cda5253d0463c29012a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, as indicated by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=how+to+draw+anime+pdf+free+download PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131551780778---19581866365.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e40ae64e4---94849279133.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/42801570814.pdfIn PDF document text
    • http://builderall.info/userfiles/file/xepisamufubudozedi.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/fugubon.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-3/20210903135325607242.pdfIn PDF document text
    • http://shamayachts.com/upload/file/96962256385.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/sarizo.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1fca1bbf7394b4b397bb8417680b7580/75631606660.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/62429955648.pdfIn PDF document text
    • https://profesa.net/userFilesfile/fubapupoxanebur.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130f663926e3---gexodesawexosavogomovi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jiwidaruserufunaniwode.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/fabodigediw.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/7351152510.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/bezajawibexufub.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/gikevunagukowukewuwik.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/18613874579.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/vezinosudisawikobuxab.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/dolulalagibos.pdfIn PDF document text
    • http://apsons.eu/files/file/36092594562.pdfIn PDF document text
    • http://trieuduong.com/images/Download/pebumofevujubojizisufiwo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132b673757e0---65183902956.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_off0000b8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F5 17404 bytes
SHA-256: 093f07c3d503b6db2efe597c742f356a47bf929b48609ea95b6372e2191825c2
font_01_sfnt_off0000e5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FD 10568 bytes
SHA-256: 6d6d2d3f5e8ecddffa8b54d7249e8dedbdd545b750cf46cc16af8abce5c78e34
font_02_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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