Malicious PDF — malware analysis report

Static analysis result for SHA-256 6577df31e0a6410a…

MALICIOUS

PDF

77.5 KB Created: 2021-10-10 13:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 16ec30385bfcd1a7d4fc7929f04a3c1c SHA-1: f02a61f0caa4c60f62c268b757cd15d68a323875 SHA-256: 6577df31e0a6410afe9686f047b4496f1bcb0e0f128889d0a06bba09465ad53a
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 hosted on compromised CMS upload storage or appear to be part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 http://carscaso.com/js/upload/files/xebajawubif.pdf In PDF document text
    • https://hab.erdenet.mn/userfiles/files/texolegevolek.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/dodazojakelupimena.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/sobomuxinimijenaden.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615851a585c5f---84521689565.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/xevudorowajediti.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/e6lu1pcgc8s5qhkqec094kak04/27724162647.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/57682480314.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/30720313380.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/92451616184.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/nadira.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/301bb2b514bc35fd4c85add9286534f5/zuravimitapelivu.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/fevojikixisokusi.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/voken.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109020754327066.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/rugofejikokifasilatinupa.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/18351522719.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/gelavawozisimibune.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/vumufevomedonituzevoram.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/420bc416e8fbdebf1e48214052e823c7/6168215190.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7967c2f4f---53903223663.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/voxavegufuwunelepariv.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/45863186825.pdfIn PDF document text
    • https://bachson.net/upload/file/19701301628.pdfIn PDF document text
    • http://emaaravm.net/upload/files/24166828247.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/5361629223.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/35996270536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=design+church+flyers+online+freePDF 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_off0000ce0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0B 10572 bytes
SHA-256: 998db5803a11206a4a2da1507910718976553aef7064c7e38eb58ea3f15a9b59
font_01_sfnt_off0000e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 16360 bytes
SHA-256: 2ebed9888e9ab98406fa25b7610836a6d477ca43b20f7c94d3460f9859dbd2e6

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