Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ef5eb2b8aee96b…

MALICIOUS

PDF

88.0 KB Created: 2021-09-08 23:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15ba5a54d779df6cba1b67f54a7f82e2 SHA-1: fb8ff4c0f9ddf01494ab2c248d75d995752741a0 SHA-256: e8ef5eb2b8aee96b4f425c78818b07893562c4ee559abecf0d2311f00de9e4ff
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://saxonrt.hu/img/userfiles/files/78341548822.pdf In PDF document text
    • http://dfanchem.com/upload/files/84469058559.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/62f61567dc1669346716094c0824afd3/namesegadul.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/fafilofevirab.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/24915969640.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135fcb7e5b18---32237748951.pdfIn PDF document text
    • http://veitali.com/upload/files/44216945371.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306f4b10710---lonijuwavubiduru.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3aaea78f---6360706325.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/n5kstv0dic38nhm1oq22cb3vq2/6274310159.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/zexazuvixanadobumigev.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/temuvonev.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/52698533817.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/ramewawaxobave.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/ziwamepel.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb3877ec4---nalozotorilakezaze.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/73020965205.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090523493885.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109031523387560.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ba04ca994---3706866568.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/27447399772.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135e00913681---babexolefuvop.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/81589730755.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/38930654611.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/dakaxajenavenumuk.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/nikuzetavelifititutedepo.pdfIn PDF document text
    • http://glassick.com/userfiles/file/83625996447.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/96037488493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=watch+come+play+123moviesPDF 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_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 10952 bytes
SHA-256: 98fa1a277f72e9860da7681cc1593a8b891bae311ec74a7067d4df783a2c994d
font_02_sfnt_off00012132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12132 18644 bytes
SHA-256: 78712887b350a15c1dd212a577beec11c9a3a71317704ed731cb7ed51a01636e

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