Malicious PDF — malware analysis report

Static analysis result for SHA-256 d009899344fcaf73…

MALICIOUS

PDF

83.0 KB Created: 2021-09-11 13:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85d4a0f2f396545f449a268caf63fa48 SHA-1: 881bf7a9dc84fe805dd7c2c9faab308c40be4f45 SHA-256: d009899344fcaf7369aded0829d25cec2e0b03ae6c4c4df0ac39adb41d8ded22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

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://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/9f7dcc98c427c4970d187707606ce8d9/32077468506.pdf
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/wisupemeganutawozerexam.pdf
    • http://swatimishra.in/uploaded_files/userfiles/files/roded.pdf
    • http://edilcfcostruzioni.com/userfiles/files/56807613612.pdf
    • http://thevale.us/userimages/wilidotetebetexujubafexa.pdf
    • http://nktrading.qa/file/files/43562856394.pdf
    • http://live-lessons.net/lcj/web/uploads/assets/file/vunetogoti.pdf
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/nafemigevokakodob.pdf
    • http://media-production.net/admin/ckfinder/userfiles/files/pawopaba.pdf
    • http://zlzljc.com/uploadfile/file///2021090300122818.pdf
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/dumafifaminez.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/rewoxekurotifuwinixuk.pdf
    • http://ud2-140.com/files/kuniziselo.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2200e22eb---donoduwilosopazanegi.pdf
    • https://techinnsrl.com/writable/public/userfiles/file/gedudos.pdf
    • http://wyadonline.com/userfiles/file/63017554664.pdf
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/89566646960.pdf
    • http://classiccar-jp.com/js/upload/files/33151789077.pdf
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/70449077740.pdf
    • http://atmaircenter.com/lb/userfiles/files/bepipazumojaxebixijiz.pdf
    • http://jinsonmetal.com/Upload/file/89238591141.pdf
    • https://cobaltinc.org/userfiles/file/32929569301.pdf
    • http://wwsm-us.com/files/file/25341302385.pdf
    • http://seychelles-resort.com/images/blog/file/zaxabolavabefi.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133989f891f1---fuvujizetasuki.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2cd1eb4b711d277cba85b6d00af59718/likuziwabe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+sdk+download+zip
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cae8.bin
33d85631febb5cde1f0425777cb8a865de256e98e556e6a03ba244cf2c03426f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE8 16880 bytes
font_01_sfnt_off0000f68b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 16792 bytes
font_02_sfnt_off00010ea2.bin
680c3276457f6c96878e30ae2ccd27eae7a0a1a2ac60c35e7ac117a5aaf716f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 10372 bytes
font_03_sfnt_off00012639.bin
fc0e67ac86046c9202d9919ff8084480097acc7f8cb0cb0d9a561fce96c3270b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12639 16648 bytes