Malicious PDF — malware analysis report

Static analysis result for SHA-256 569cf98838938f69…

MALICIOUS

PDF

90.1 KB Created: 2021-09-14 12:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 96722d3566f53a98f4015575f81c1f54 SHA-1: 692461b7e12ccfa0a71964672ee313cfe45cb0fe SHA-256: 569cf98838938f697f65ca4f1b3656904c2cf9d4eb573a985f0c7f4187ee940e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to phish credentials or deliver a second-stage payload via the numerous redirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://garglob.ru/uplcv?utm_term=funny+emoji+gif PDF link annotation
    • http://qlionshousing.ca/userfiles/file/84360515573.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/cdf3e9b35acc378751bc34782fc8b9d0/66466225637.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324dc676bf5---45583154670.pdfIn PDF document text
    • https://themalc.org/files/file/26660222038.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/76695163357.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/6834005920.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b62fba43f2---78077523234.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/kelugup.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/63360699873.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c63ccd32d---muzumumepakonopakoge.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/puzanegakedatoganubo.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/gatomusulenizobujekedowi.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/jusimufajegobaso.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/todadunaluvezidopuxiruval.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/56886359477.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1b000nggsf61hvioiqmku2ld3g/donefutidose.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/lolom.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210909163054.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/78490562703.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/24192849658.pdfIn PDF document text
    • http://espwireless.net/uploads/file/82967501101.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613259f2c1880---39735439689.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/xiberijulafijitetejo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff82d28fc4---xubololetufibiguloda.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_off0000fb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 18988 bytes
SHA-256: 15c0194e1f1d41b0a69468f5087b09cd4de4d90d0dbf90248485f90e2afee496
font_01_sfnt_off00012c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C53 10304 bytes
SHA-256: ae557e1ab9c7f59ba97aeda068e876930f7a8145b784c4c486ae60f3bafa4d8a
font_02_sfnt_off00014378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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