Malicious PDF — malware analysis report

Static analysis result for SHA-256 274d6637fd60322d…

MALICIOUS

PDF

86.1 KB Created: 2021-07-25 12:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ed7214246b82616a662b5f2342107276 SHA-1: 250aacb01aeeb87a62deffe66694d4bc00fdf0f3 SHA-256: 274d6637fd60322d010e1dde7bca869e1f55be3169c97412141d5cbe9262a8a6
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external resources, many of which are hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a link farm suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning for wider reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ab08fd0dad438c1dfc66332d5dd85bda/8238386946.pdf In PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e1da2ff8337df2ad2bf2e0942542ae61/73023234222.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/9ikinvbis1dsk3k32m4bgvpesa/geluwogik.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/55827169931.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/75625802673.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e3081b0b---bejolirabujifovaginumenaw.pdfIn PDF document text
    • http://hnspkjx.com/d/files/15158602870.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/50614723060c162c2c1c4e.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/5ba5002ef461779dc46972afad34eb58/37334034044.pdfIn PDF document text
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/xinedatewogeb.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7u6kjs04hqkoaatuk48jpdu283/fipuvoxa.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/eph05eb0n5dul8a6dma75mgh2e/17611474277.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/88201627626.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/06odalfqbkeo525f3uba112ipj/letavamotefozuvapijo.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c5b5de248---furivopofowagiva.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/fatarexubijomukogipawa.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/gabiledosutolasuvovi.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/nejama.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/sugigetexadoxu.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/sujabis.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9u1c4buu306ue4r1k5javc96a3/gekafevakogok.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cddf457ef84---7443850117.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/14360180739.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/15948339595.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4751bea6e3---24947065429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sketchup+pro+2015+free+download+full+version+with+crack+64+bitPDF 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_off0000e7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B2 17564 bytes
SHA-256: f486117928e909f385f8a1eaa6e8dbca622916363814b79654e747b00d7a8f2f
font_01_sfnt_off000115db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DB 11952 bytes
SHA-256: c02c56e4240f8488e1f3afcdf419d8b09a93f4d50ed89ff978e92006e3b4f151
font_02_sfnt_off00013281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1