Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e26cf5ebecdd86…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 12:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0a5ab4d23721de513d02e4048f4bc45 SHA-1: 0eed1fd6f5c1668f88e1e6b99008ddbf2af32645 SHA-256: 25e26cf5ebecdd86f84a455484ff5d60631c111acc8aec2836dab2991c3840d3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm, combined with the compromised hosting, points towards a tactic of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=modicare+product+catalogue+2018+pdf PDF link annotation
    • https://bamfieldrental.com/userfiles/file/buderuzamepilapuke.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/zorebutobi.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/64343296135.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/41bcdb12372e29bb19296323c4e11815/46641305050.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/29167809568.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611ebfd17d6ef---50563674620.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qu5bpocm5vvleolaesg53pq1s3/jufudelulujovitegarusemux.pdfIn PDF document text
    • http://eternoohydro.com/d/files/96205558587.pdfIn PDF document text
    • https://basisangka.com/contents//files/50350309222.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e2d03f62b98bfd805b64d399357c9645/52969037372.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/91c4c658287ce2f9adc3976219d89cdc/lefip.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/nejewefa.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rotekaxi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126f4046f49e---gepugus.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/35773417470.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/40321424200.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/wefemuziwoti.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/69759665360.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/6583485392.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082eefe3c2d0---kegusevazagixezutariwefap.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074d391c245d---bikojuvadisiwix.pdfIn PDF document text
    • https://ka-base.no/images_content/file/galivamiwulorijuvinopud.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_off0000c9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E2 11120 bytes
SHA-256: 0b5a3b8c68a80a1d450500ee9592af250c0d5418310a2bc34b03edf56ec734f9
font_01_sfnt_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 19608 bytes
SHA-256: 0cf35423eb938f3fa235568fd741fdb59db561c66c467f1a737ec734dd1a3055
font_02_sfnt_off0001180e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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