Malicious PDF — malware analysis report

Static analysis result for SHA-256 9288e07d52610b42…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 00:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5cafd796b7bcf1ad9aefc95c6f4a1113 SHA-1: a3a756c82dcdcff59a1e3b5a6955d0c438ebcc4b SHA-256: 9288e07d52610b42e11c0c0388b5c5f8754b093842a17d8bf05ca0acd68c8287
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://smidgel.ru/uplcv?utm_term=space+shooter+galaxy+shooting+mod+apk PDF link annotation
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/e052c4cdbea17bdc4ba188477ad37733/10207054087.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/45152592109.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/miforugevi.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/32034578475.pdfIn PDF document text
    • http://synfarm.com/upload/files/wuriniradobifobuxa.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/71156464900.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/14693905868.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/gevagadedu.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/92822338951.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/bitokij.pdfIn PDF document text
    • http://mrybalko.ru/files/demilimodal.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/foribosobat.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/boxagute.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/nidozapobazix.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161324f1e02a8c---20925609387.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/bufatilonugom.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/63526401409.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/xolukudurej.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16147a5821c3c7---supibulijululov.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139d54ad81e6---12975683668.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/21136391520.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/b38apeur5n7ml8ckdjm89c92ko/safasogalorejiluvesep.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/3822998431.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/rupewoxotigoz.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/wigowuduwurivi.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/ganul.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_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 11344 bytes
SHA-256: d46df3adf1caa7c3131c5416edad6c22c477effc7c93072f2dee4cacd93da1fa
font_02_sfnt_off000110a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 17812 bytes
SHA-256: 584f15d68531432ca222e640462bcdfc6e281eb76c29da7b6873db0c20e97633

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