Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fadaa438a08e00…

MALICIOUS

PDF

87.8 KB Created: 2021-09-01 05:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e28952791cfd1ffd916aab58be7e1e2 SHA-1: 5bb03a67016185c3097251c38ad1889929ec285e SHA-256: a0fadaa438a08e001d426c8713aaa023ced5f4054e45af4d6a8d427912fd2d48
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicates maliciousness. The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to obscure the final destination. The 'SE_URGENCY_LURE' heuristic further supports the phishing pretext. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious document aiming to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/uplcv?utm_term=mba+quiz+questions+and+answers PDF link annotation
    • http://gasasosong.com/upload/fckeditor/file/30582972677.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/74255578754.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f3a24fa62cf251a3b87ac255ae55c2cf/31554116500.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8cf667919---kijunenaju.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/gisodememogo.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-08-13/images/files/26525598760.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/38544a6a649f058117eb1ba28de7b376/42578736837.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/32022601729.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/87297568603.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/9bfdc19fa437defd1da7544a8b974cf4/kiroxijigadewalifotetigo.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/al1ivoh9edugrrdk7cjep4v2t6/domafaduxelo.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/kanebalekediwilalito.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/e4cafc57b9a4081391861dc5f7672e1b/76114702024.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/finoxizezadakilamejareb.pdfIn PDF document text
    • https://coluer.ir/documents/file/kadagazudonisatugusu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e985d3b705---89373568732.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/54868483539.pdfIn PDF document text
    • http://sakem.org/userfiles/files/ximokivagekegixipoju.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/jasafonipitobigulesoros.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/voxina.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c34abc5d1bc---nutuzirorodaletenux.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/vavalomaratudojefag.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_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 17872 bytes
SHA-256: ffa9ada062ce64f873a04fb3bd0da7d857e9836c821eb15445db0f8541a88752
font_01_sfnt_off00011fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FC 10720 bytes
SHA-256: 9815f5fba5e405eff12afca53e588262bdf0dceb66d7cfb6f33b0fddf711b849

Open this report in the interactive analyzer, or submit your own file for analysis.