Malicious PDF — malware analysis report

Static analysis result for SHA-256 850a1ed70cbdaad4…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 20:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ae98e8f1a89516dfed8afe0e2d54909 SHA-1: 9ce271ffe339ce1d7886d6041c2a7e43c4db7a1a SHA-256: 850a1ed70cbdaad470655a9e79ed1e3a191ee724d12a97ff40525e60ed1ea41f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://chcial.ru/uplcv?utm_term=ps+touch+for+android+10+apk+download PDF link annotation
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/get2df3cscspsp9q0b62o9rld4/xivemod.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/nixilesi.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210621224935.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/fovukinolome.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/daxawupujavusilibazafam.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/47814001835.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/89743564966.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/togagepini.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/54006672152.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd869605e2---pikodabuxunebumobezi.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/52176366533.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c22699551---64780313965.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/jifukex.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/nugidavimoxibosixupixov.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/muvejovigoluvofagelawegim.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/94832517648.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/zonerozo.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/zinusozijos.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085050d8aba4---zowolugigo.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/xomazubetexo.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/xesos.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16121b12b67a48---92410147873.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/susunulixebalafirelem.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/5a9a3e920d2d84f6f3339ed8b579b27c/wolabowowabedomujejet.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_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 11036 bytes
SHA-256: 694e162494a919cc3a4448ddf6a257fe52a672f16c30a29343247a60142dae22
font_01_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 17696 bytes
SHA-256: 996fa58096f9dc5e25c9fe93192648b6b0d9ca777868aa84c77409f3aa1c0973
font_02_sfnt_off0001262e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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