Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97548095a556cda…

MALICIOUS

PDF

87.3 KB Created: 2021-09-06 02:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f1968069a4dcd20969c4bbddd749a1fd SHA-1: d1ebc6fb8a6927ff1d1acd57d38d210a298a5114 SHA-256: b97548095a556cda8dd1618dc37012f52a8c1fd6a466e688a343923c92ebffb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 http://canigrup.com/userfiles/file/xipef.pdf In PDF document text
    • http://bbdecontra.com/userfiles/files/97233741937.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e41a84463---wekobupenakuwudige.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/99800235129.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/51577225506.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8db8de9f5---xupekivodowijageduwetu.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/74188040147.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-30/20210830182253252708.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaa13b0227---tipepatif.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/8e5a1ea607de7469039bbb98634c6a3b/68988771531.pdfIn PDF document text
    • https://edarky.net/data/file/zojatodelabowubinonowofo.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/05f19b50d407b8f0e27f959e8c7b047e/tizajiwuvinavojibarad.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/movedatimodotizunejumudi.pdfIn PDF document text
    • https://ecoretras.com/file/23652063846.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/28394048448.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba08943defe---losifigafubuguwofa.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/kiluviwifaninijonemi.pdfIn PDF document text
    • http://i-dron.cz/data/file/25638758978.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///saniluwofivibo.pdfIn PDF document text
    • https://alohasafaris.com/files/konurateja.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/52884128665.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/bajibebawofapuxuxivegi.pdfIn PDF document text
    • http://clickvay.com/upload/files/noxijigeboxanopodesimada.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/xilajezadasunevusexabu.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/7b88d7a57e805692d33b49e1440eb1f4/22414417782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=steps+of+research+methodology+pdfPDF 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_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 11060 bytes
SHA-256: 8367f4064c278fd258eba114c0caa7e4a5a4c1ad03c3cc52fca57d4b02c63788
font_01_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 18304 bytes
SHA-256: 05bd18efb224dda05fbaae1a19af1649d9fe732e1ee9b655e8b733d8f8fb6f02
font_02_sfnt_off00013716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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