Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf2dc2bfebfebd4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 17:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5c1ca240a067bc9d737cd416798f887 SHA-1: f59a809d8ab9050b23ef2bcf8ed20716ab9f0d77 SHA-256: eaf2dc2bfebfebd44eb6243a380c9911b14a9624663ca5ba002c5d40484e082b
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The 'Browser extension / update installation lure' heuristic strongly indicates the document's intent is to trick the user into downloading and executing malicious content, likely facilitated by the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://drafthe.ru/uplcv?utm_term=how+to+install+apk+files+on+windows+10 PDF link annotation
    • http://dpholding.ru/uploads/files/nutezubudazom.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/gunamup.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/tevinufenolizegoremapol.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/fobukoxipanap.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/36500246053.pdfIn PDF document text
    • http://modern-pro.ru/files/file/razupumawamaxe.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/74131697057.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/36809982399.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/romenudujofonolatujifap.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/valevefixosi.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/pidokizugeziwuxom.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b1d82ac93---wigapafakevag.pdfIn PDF document text
    • https://curvy.tw/upload/files/68643145800.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/79135607180.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d6a92e0cc---1434864660.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/ganilesomagiro.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/litawafevozelokesaparu.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/14565864389.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/viturabejokilinovim.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c25447f56---vojuvibigitinilemoxogani.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_off0000d34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34D 10736 bytes
SHA-256: 814f6200a92c3f703e025d83f637c56e752c6c9918af6140201aaa900df6a4ae
font_01_sfnt_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 19244 bytes
SHA-256: 6dddcce7aea116db445e955a4fe2d40d86f699c24efd6d4d5436dbe1657674e5
font_02_sfnt_off00011df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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