Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6b91ee74e1025a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 09:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16b21fe6eeeff3ce490f2b03676db2a7 SHA-1: e3407c0e6ced656723462842e82fe4cd02a7b61b SHA-256: 1d6b91ee74e1025aad5d94d92262a43fe9e68b3bb08e7bcad0ccb9713548bf34
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://enewind.com/pliki/file/sopopulojenofunanulaba.pdf In PDF document text
    • http://ijfbn.com/editor_up/pufewasovorejaxet.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/wupevirulorupimopunidavu.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/jotinoxoxidotugoti.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/30183411390.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/jutuval.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/dosonuloxamug.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/65131888781.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613908adefc44---xixebotidagonowaba.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/japebemomigofif.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/55313601936.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397f71b1aff---47500437777.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/81383659048.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/pskaebtn0gbq9b24st5k8njp76/78117083065.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9c3a0af5b38c5b8496b815b40531984c/44684993192.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/kuvolopexosadudunujuvusex.pdfIn PDF document text
    • http://leguido.net/files/fifakamuzit.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109040347028547.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16131a25989764---disuzufowibofelulanutu.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/62936479962.pdfIn PDF document text
    • http://upakuika.com/img/file/titug.pdfIn PDF document text
    • http://schokozentrale.de/idata/64036924538.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/mefapajulepopima.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/84257784447.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/powefipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+gold+rare+candy+glitchPDF 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_off0000ce26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE26 10856 bytes
SHA-256: 648420e2fa2c9fd05f7b18ae24689efb15ba9d1639334c5951d1b3b9e265fbc1
font_01_sfnt_off0000e6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 18972 bytes
SHA-256: d14aaa2588c6df1f7c7fac016cd1a2ad2702b95aa1f9c1f0e61b18c2515c9fb1
font_02_sfnt_off00011890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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