Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d71193236c5e412…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 19:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f95d67cd78128ecba6b0802b85d8e59 SHA-1: e409480bae2d01c8edeb76d4729300912d669f94 SHA-256: 7d71193236c5e412eda61f336d7f206b59c15bd02edf9521501c4b4e6ca51358
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the presence of embedded JavaScript and a link farm pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution lure. The document body, though heavily obfuscated, likely contains the deceptive content to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/48147575128.pdf In PDF document text
    • http://masan315.net/board/imagefile/file/82073117784.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/revoposunuwamebaga.pdfIn PDF document text
    • http://tion.hu/upload/file/bolabevesamojivokilov.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/7175834131.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/bogilobegokufunuratu.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/1123352174.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ijnua8cl9vvrct46ocqnn8k7p1/lawud.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/49785001113.pdfIn PDF document text
    • http://holzbau-napetschnig.at/20977570421.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/65630981893.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/danirapuse.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/11144230776.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/duvelesavumalel.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/jexojodosif.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/50497152250.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/77538474842.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/sosupata.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/66996513811.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347db7ece19---suzurigozawo.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/87476075551.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/427247e5ceba1f478dbe7a1a71a7e15a/31387686919.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/jidazibataguguramo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=expo+create+android+apkPDF 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_off0000db69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 10468 bytes
SHA-256: 3da2a24845d0b01426f82d11a1303034ea29772b8114203bb241aff435ff51e8
font_01_sfnt_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 18240 bytes
SHA-256: 639acdecb584a25c67260650ac372351b21ea6c9f50c739bd711a8d028b23c45

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