Malicious PDF — malware analysis report

Static analysis result for SHA-256 7411d78dbc591343…

MALICIOUS

PDF

80.1 KB Created: 2021-09-10 06:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 371c69d717fd6cc80b2a4dc70c422704 SHA-1: f6fe7f3eabcdcf38f2ec5f3140174e41fef31712 SHA-256: 7411d78dbc5913436df8ac62df2b942b997d9defa4d4b35e4aecc78f82447a3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. These links likely serve as redirects to phishing pages or malware download sites, as indicated by the ClamAV detection and ML classifier. The presence of JavaScript and the link farm structure strongly suggest an intent to deliver a secondary payload or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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://coretry.ru/uplcv?utm_term=wpa+tester+apk+download PDF link annotation
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3d90aea1ba42625685f34a6fd4a95e02/lazotami.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134008519c6f---fonofevopubis.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/munoza.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/janirugokubatufelurem.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/5731254377.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210909_46B61275192C2E11.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/repuwixakigefudaxexes.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/dewofuvoziwosotusigu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa06eb50eb---52770983640.pdfIn PDF document text
    • https://mfdesign.hu/files/file/kesuresutorogukewe.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/sines.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/zetufefi.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/vuvetefapetowezexesamore.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/nironojivaz.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/bea0542dccf48314a31bf1621d958a59/8263821086.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/gobuxipa.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/84406307964.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/rilalexutivuwaxipuli.pdfIn PDF document text
    • http://qdjshg.com/files/file/godewisoberu.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/71224462142.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/bururisifozigetimo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acbaa97e02---49971540832.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/19934105028.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210903061543.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/rawuzipevijamaninugex.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_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 10464 bytes
SHA-256: b25125618f43b9e0c3ab2847ef45d91f82046341e91591704ead9f498eb39b19
font_02_sfnt_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 18004 bytes
SHA-256: 275771e0e3b0c44b5c561d62347a1e175d0fde0a671fab5a04c9b37ab92a9c19

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