Malicious PDF — malware analysis report

Static analysis result for SHA-256 89bb24cd67886b49…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 03:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ce0f6fdf4cb777f48e4ae20ab49f289 SHA-1: 629e2f4385a1da71b3f30ab858ffddf55f3012e7 SHA-256: 89bb24cd67886b49f840c1f38f96fe8a0afb357c7fc5f71e7dfad7458bc012c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for phishing or malware distribution. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613b35406ad55---83197337354.pdf In PDF document text
    • https://lionkingbali.com/uploads/file/81223482082.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/39824136459.pdfIn PDF document text
    • https://hotelcorona.ro/files/rored.pdfIn PDF document text
    • http://atrsara.ir/resource/files/60009449466.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/50072504746.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/43310774860.pdfIn PDF document text
    • https://tsegypt.com/file/85546618486.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9579d60fcb3dc61c0389c6d9b5b6ca54/81185537022.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/fumisokedu.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/pafilox.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/tawobufevoj.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/mudabamudesotul.pdfIn PDF document text
    • http://handmade.sdelaemlegko.ru/files/userfiles/files/69462349711.pdfIn PDF document text
    • https://hotelcorona.ro/files/46590004450.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/85292746026.pdfIn PDF document text
    • http://antopol.topmebli.com/content/xuploadimages/file/80390875726.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/toduseturamawigibo.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16143b64ed0461---zijuwetaxoriketujebavepis.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16135808f6eb85---92678063259.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/vedatobotivubulolinim.pdfIn PDF document text
    • http://letnaterasa.customreal.sk/data/files/77092872754.pdfIn PDF document text
    • http://metzgerei-bischof.de/userfiles/file/werad.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a896f07f87---wozozimiti.pdfIn PDF document text
    • http://esistore.be/userfiles/file/49167673838.pdfIn PDF document text
    • http://maksimetall.ru/files/67169921989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sutar+game+downloadPDF 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_off0000b4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD08 14780 bytes
SHA-256: 708a1bde05a5e813131fa7a55ff03d5a173c67e287e1042273722dad1a7aaad3
font_02_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 10592 bytes
SHA-256: de982f03e59e8bfab2587d6c0f235ac0cfb011e565741aa2da5b5925680ee2b2

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