Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9437da05b27d13…

MALICIOUS

PDF

75.4 KB Created: 2021-09-16 00:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 20e34f5845436d4c35e1d3c5a97e40f1 SHA-1: 273eecadbcfca1f750587d7332ecde7965423f8e SHA-256: 1e9437da05b27d13ea4462df2216346d443e06dc539569c49b67d9bcba7a3284
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=vola+sports+download+apk PDF link annotation
    • http://compow.net/ckfinder/userfiles/files/xebilejof.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/11410302429.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/tazon.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6ac06f0fb---90724464783.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/vesuzi.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/16474194984.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a696f2eabe---lirumu.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/59481423955.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/bijudebibazarigepidevoz.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/petodagovape.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/lidisutosewij.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/97817531401.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d185011ae---23413549588.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/manatugakapawefimenu.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/97602772836.pdfIn PDF document text
    • http://midel.me/userfiles/file/86099235633.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/66265475364.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7d11e2d7078fb51158b49e61d2139fd7/xigexebigokuwenipirefitik.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/bigirubesavalave.pdfIn PDF document text
    • http://babamoleskine.com/files/file/36075872680.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/5phcpd378va1s10kd4dlcu2na2/33687556603.pdfIn PDF document text
    • http://petrduchek.com/files/ruzatukozane.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/maparus.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/zixezaj.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/pidofamapak.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_off0000c513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC513 16936 bytes
SHA-256: 08f32d8fcf2b26f21d93b8ff9dbfa9e9e4589c8ff9bc10b01ea23c6120dfec46
font_01_sfnt_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 10308 bytes
SHA-256: a1c9b7cb2100ec6135b4c87507fa01fd8aba16a2c9ff1012cf48fefeabc73a70
font_02_sfnt_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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