Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e787fea0606e0fe…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 11:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c8ff6988ea83eb301054aaf75bc2cc00 SHA-1: f8848c51e99396f286c05be3623ca2d03062d690 SHA-256: 8e787fea0606e0fea6d8a49279c5efdca0beb32a9c62067c5d123afa63c647c5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The heuristic firings indicate a link farm designed to direct users to potentially malicious content, consistent with phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=gerund+examples+worksheets PDF link annotation
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1b7f4a38fcff672ad4525005a448e655/70900385246.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/48987118237.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f9da787bab0b1992b1dd4a5f764e29d3/17237586917.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/piximu.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021082319332373499.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/53189129123.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160bad501dc0c2---zanikadozariwewe.pdfIn PDF document text
    • https://semut73.com/contents/files/67520888714.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/6547783488.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/dp0rif5tn1cmtkn9jecd1m4qia/fopubumobuzonosuzajab.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/batumirawodolisitubaziwel.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/5ef809a037d5e83967b6efcf4cc79fd1/34926679331.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/sutebepakulesagafozanonod.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/vupefatiguselopogunuvivo.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/30893820678.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/18891056413.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/48693225265.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/4d75eff9dfb218722ff00a80c6e1abad/78604012329.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/39826524065.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tozox.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/766e49ba5b9acc8327739a0e69433897/vovutabilamopip.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/80059788833.pdfIn PDF document text
    • http://cycling-software.com/files/file/87345879846.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_off0000ce9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 17752 bytes
SHA-256: 5ffba50ed0682eca25f6c095b02a515a7fbb09cb86ae044160f93281a0d01cfa
font_02_sfnt_off0001149e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149E 10984 bytes
SHA-256: 568fcadabb45f3e158b7a40a2bf8cb1cbe83d9ee1ec923b578b2ab5ced3a3002

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