Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3af756a1dfd6ab9…

MALICIOUS

PDF

129.0 KB Created: 2021-06-11 13:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c3c3f7699dd3cb577be0d70ad6b31634 SHA-1: 1a68e3940a084521e674a8ecf222879f7b9f08ba SHA-256: e3af756a1dfd6ab9904bc102735d71e977b1e8f375a0eacc136f3d93141324e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'Animal Farm', likely to entice users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=chapter+2+of+animal+farm+summary PDF link annotation
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9f291a0d41475622924c50f4ffaaa5f0/rogoxejemowureruvakof.pdfIn PDF document text
    • http://moristas.com/userfiles/files/nepoporidawizijejis.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5c44ad2c429da41da5003be71b6547e9/dolajalitij.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/59842046767.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2bc3f8a101fcb0c1dfceb76d04749e67/zixosemosololapovu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094d7f0dd5f2---pofewesudidozemaleto.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4717c4050---11103226629.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1876fef256---1573602872.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/jujaxasuwopomixogototab.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0956c5a651---nupefubabosapi.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/piwoxebakedoled.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/dh59ons7je3f8s19abojc1d4la/92631991480.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/dusofufetesoromilorugat.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/7de15cf531bcc131b6d43c3dc94cfa60/zomapesunuxaropuda.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a953200ae89---82590287728.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/6d036153675a1a7210ee1680751523a3/danifoxujole.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/jatuhei0epq2kfp17vf7g0vhbn/77172048503.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076161e44b90---60736240636.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/jediwamegipirimipefumalux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC1E 5280 bytes
SHA-256: a264b41911a3cab0b469706f377406e09573f2d58cd0fecb73866b50c96e6f9b
font_01_sfnt_off0001cdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDEF 12080 bytes
SHA-256: 154abc1456fba57247f9e625dde5bc0b2ac3721996ec52830ed5894c6510d64c