Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac9b2826c8a7a3c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 21:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c52668873e578404641ab870172523da SHA-1: f089eb858e4486428f0e189bbda26422493aa4b0 SHA-256: 8ac9b2826c8a7a3c6112b7ed987cce50eff576c009cd70b1e1803fe02f1bdf80
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting, likely intended to lure users into downloading malware or engaging in phishing activities. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation to increase visibility.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=tutuapp+new+version+download+ios PDF link annotation
    • http://togclick.com/media/userFckfiles/file/mutesikovuz.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/fbf36880a1f74755c901e1fb2d0a1ba6/totogedigibugixukanolepav.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/faderuvarilufizarewolere.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16139b9bb395d8---melakumalew.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/zaxaxotimanuparakuf.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/vanatamixuvowijimafamipad.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/75930238999.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/xalogegojigopa.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210906_dd057.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/87258844405.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/53888596132.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/nefigujered.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/bemagesate.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/sonetudevinabugipajelufus.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/dedafekodakozinen.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/68377027654.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/31726377370.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/bipanaxajisi.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/73760562014.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ee1d867e3f3d5ac760f36afc64e91a4d/pezapafukuwonijezaziro.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/28165512261.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/zorutetodapemet.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/48536104614.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_off0000dbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE8 17148 bytes
SHA-256: eac7f23ee57136aa76041f3de4eaa96f2dae4a58ccb03369cb48c6bf28087346
font_01_sfnt_off0001086b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086B 10600 bytes
SHA-256: 4cba8190673f25e01ad4413faa0f1fdf629c0d293cbd68808a932f545675ede8
font_02_sfnt_off000120d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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