Malicious PDF — malware analysis report

Static analysis result for SHA-256 195ef48a15d1dc3a…

MALICIOUS

PDF

74.3 KB Created: 2021-09-07 16:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4eb15cbea4c3206386b790bf51fc9e72 SHA-1: 0621bd90149b2d4a6fce4c4556782c5c3404931f SHA-256: 195ef48a15d1dc3adb9ae3edfda492d624e9e26d34dc2684c5f81376d00bf97d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing malware or phishing for credentials. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious download or redirection workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=switchgear+and+protection+book+pdf+download PDF link annotation
    • https://wegofa.com/userfiles/file/fudof.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/sopubexudul.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/77136754871.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/34840548092.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b0880a06979da8b25179b32a4c6d9bbb/wenorej.pdfIn PDF document text
    • http://scriptonica.ru/files/files/29124788874.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/kupitigusulitijas.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940871baae8---riterev.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/7233119733.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/bonabub.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/11702446763.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/55737841293.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/25416128721.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/zanufevadukidibizi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984146b4c32---tegojogijet.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/niwadurimi.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/92284764693.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dj1d4puo78ceoo9nvdvj44cu3j/57554909862.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/maxaloxafobone.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/41548679177.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/kurejixezepuzebovebuzupon.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/6e148bd02d3cdd31601ea08f3081e50f/dewibuvagewelibedakisugo.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_off0000c04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04E 11124 bytes
SHA-256: 1eadcea1d075c403ffa97329da0805f95e2a5c66a0103c1daba1f974991279e6
font_01_sfnt_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 16144 bytes
SHA-256: 9e4d4d0e98070b94b07e0ecf74351953d21841cf25e841e425485edd459b0f4f

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