Malicious PDF — malware analysis report

Static analysis result for SHA-256 debabd6522820d5f…

MALICIOUS

PDF

85.6 KB Created: 2021-09-08 06:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69b9e14cd9c9c43483a9d38cf30bde5e SHA-1: a1472b83f58b522ffe5ef7af3c7b642affd81688 SHA-256: debabd6522820d5f4b60ff7888455e0c5e22521ea0cdd5bf11bbf6d7084d7aff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://ladangmimpi.com/contents//files/63888752133.pdf In PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b60c74d30e2---gapabu.pdfIn PDF document text
    • http://siembra.me/uploads/files/43047469317.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/futekesefomo.pdfIn PDF document text
    • https://korankertas.com/contents/files/junomabasivedikemu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a47180f592---watugiwerozu.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/20349214451.pdfIn PDF document text
    • http://pasted-radio.de/web/files/jozebezelikene.pdfIn PDF document text
    • https://hsse.cl/files/19555267238.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ed0eab69d---davesaluriwusalerifekafu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/4e586cccdd9c33b1f438ae50cb5ee214/15580379724.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/20f7c11f5a3e455f486b5aa2a854cd42/wamizoteju.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/baxekobizepes.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/68252003743.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/jemosonavosobav.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087a67944eef---29660482285.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/86563664289.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1611ae1aa277a7---popajoxefiludulapis.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1626488609.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210708141134944313666.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/72155221016.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/31459307815.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/63268274571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=naming+branched+alkanes+worksheet+with+answersPDF 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_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 18072 bytes
SHA-256: bb8ee3b8a65943d31556191dede4e8bbb187380fce82a72990dad9bc8659cef4
font_01_sfnt_off0001170d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170D 11112 bytes
SHA-256: 47c2f928b0280d407bd97d8bfc6f66ab820ebe4a0887fc5eec30e23fe23c26ed
font_02_sfnt_off000130a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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