Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bf6b7ed617aa4a…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 19:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b02c64ffe03b9097d8572baaf0babab SHA-1: e14f069cd164602d78630f23ac13277b7503dcc9 SHA-256: 93bf6b7ed617aa4ac6e8b4e26f7658162d85ee16ca7780a7b8f0ba9128d658c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/hotd6743a1un7qnp3jibeho8i7/dowatijavavofupen.pdf In PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/guxirufituresowijo.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/lajedeto.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/50727077069.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b040c34a8f4---38262870855.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/57427508279.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/wuvaf.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5i9j2d5i7jcge1jch1ur6p8viu/kafomebodunirixep.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/tujuji.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109e66e00ca4---51470601579.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/jofeluxevir.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8b612b595---43304626325.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cf02a8e2f6---nukar.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b6247950a---9792778127.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/povesaxaxonupevoruzora.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/votonidetefugixo.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/dibibesepawodivamuz.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/32283967339.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/7ba13727208b1d4f722b27ee90570d08/jabaxazikukigajol.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///17864767124.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/95159910618.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/tifawinuxasukebasil.pdfIn PDF document text
    • https://successalpha.team/upload/files/64806035092.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/42866837914.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160806b75efa16---lapuvakojosaz.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f68ccf2435---xodogakimotalemorukozurip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cyanotic+and+acyanotic+heart+disease+pdfPDF 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_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 10816 bytes
SHA-256: d5443ad883936f725407b73abe55c0d16287b8cffbd7a5bec5fdc7a565d4bcc0
font_01_sfnt_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 18052 bytes
SHA-256: 86c7fd7783ae96b41e60c1fb276118a0a265ecc9a42f106eeb514cfe760cc025
font_02_sfnt_off00012b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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