Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a3ead48dd06137…

MALICIOUS

PDF

71.7 KB Created: 2021-09-12 00:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f0c5ecbf5c6fd0f1e8365c9d3511488 SHA-1: 66ee3578c4316473e4c6ad48bacc71ec34bf05cb SHA-256: d8a3ead48dd0613741301443018877723426698abcfcac8564afd85f36b57632
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://talcmanagement.com/uploaded_files/userfiles/files/17000533715.pdf In PDF document text
    • http://aloisiquadri.it/userfiles/files/47179970188.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/29235636825.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/kuxuxogewafarorovigutaduj.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109120501136338.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/76913943481.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/49535511067.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/98347815393.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210902092806.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210903000239_24520735.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/febaton.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/rijebesolujap.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/gidupifesizufatefaguw.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1a9be5491---46077799951.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zaposetusamefovusumisisiv.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/44d3f846ca95bf595152f342643b9290/jaguzogajarizonimufudo.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/sewoxatesafuzoga.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/86696963823.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ccebac974eca5134c337d6e426ce4c6b/79174741119.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/65812493731.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/xugonulomewutozexi.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613031f351ce0---pulir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=boruto+episode+61+english+dubPDF 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_off0000b42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC41 17116 bytes
SHA-256: b626ef3e33a348874a0c46c53b708025c6b88b5f98a23a2d65274be6a59b5768
font_02_sfnt_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 11020 bytes
SHA-256: 2701db89da0f9f5f0e180d21eb976f3253f12dfed422b1c43f4be9e978d35b8b