Malicious PDF — malware analysis report

Static analysis result for SHA-256 baac15769ebf8e37…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 19:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3c79e6bfb300490ec282df51df57e60 SHA-1: 30f669b3cd96527ba390e170fe4d7d90d4d75f9f SHA-256: baac15769ebf8e37400490a8839d9c204f7a7b87ace3f60653848b038b598b85
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a URL related to 'wifi connected but not working android' indicates a lure to trick users into clicking malicious links. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 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.
  • 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://medvor.ru/uplcv?utm_term=wifi+connected+but+not+working+android PDF link annotation
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/75841534806.pdfIn PDF document text
    • http://glassick.com/userfiles/file/vuzuzetozateniluvone.pdfIn PDF document text
    • https://alev.az/userfiles/file/56372795567.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/62480804791.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/bugenetibutoritabavulugon.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/20661091791.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16149fbe3bf365---9612436506.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/66797485171.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/70297418939.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/gimupafas.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/36014503030.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/25112565005.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/43107589344.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/44589001988.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/62705680878.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/33640086992.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/winesamonufujelexirax.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/fapadudemeraroninomani.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/jobawobufom.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c028acef9---nitalinosoribo.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/jujiwotegozusurafis.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/lejewimifik.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/48174567768.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/df6denjjtnhefh7kcdat1j8156/3163896986.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_off0000b0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DE 10848 bytes
SHA-256: 832e4a0b79c3001d70d2ad25c6442797f4493f49a86f2fe1fa201dfee2d16a81
font_01_sfnt_off0000c9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EB 17292 bytes
SHA-256: 7ba1fabb1e0a4443d8bad027fae974515ac388dc8708fa4c3f3af0901ef79a92
font_02_sfnt_off0000f52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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