Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1c626c91cffc3c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-22 14:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35653372613dfd9e5ac008b49c5df3ba SHA-1: 2fc370c475604a9dafbbb00bd870fdb7b9c6f22c SHA-256: ef1c626c91cffc3cf4641dff37c47dd0cd261c1d7ed6be9ed702eea57f2ae073
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to numerous distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to obscure the ultimate destination or evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

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 https://krisoc.ru/uplcv?utm_term=ios+mmorpg+games+2020 PDF link annotation
    • http://ramenhajimetustin.com/uploads/files/66057688788.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/zidemukudofugo.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363e2ea9bcd---tofisobumez.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/vimaxan.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/goxagepamobadowolulabixes.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149483c9ca8a---lekob.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/gabivudodidoxexomezonebu.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/10931326267.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/91911881729.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/63498128896.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614117fbc044a---16271297443.pdfIn PDF document text
    • http://domplus.su/userfiles/files/46531652984.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/xetojorugej.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/fekejoripu.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/43079425253.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/fodifarojetu.pdfIn PDF document text
    • https://micsys.in/userfiles/file/bodutilexokimuwavidola.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/melelalutagaxo.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/fexakimodolodit.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/pepuni.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/70153994668.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/lokuvogimejalazojijigoxon.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/27525523905.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_off0000c4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AF 17060 bytes
SHA-256: 248812bd5cff8ee5f2114423e8472a3e7dd09c04194a0eae8bec634ba40af4f1
font_01_sfnt_off0000f0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 10448 bytes
SHA-256: f48530773ade6cff0b6670aaa297c7fef23e3744a398078406cede8bcb7cb0cb

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