Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcedfd4c48dd3f1…

MALICIOUS

PDF

71.7 KB Created: 2021-09-01 20:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09200ee53220c0acbceeb600febee691 SHA-1: d0cf5e48584cedd98cc017715f1431fa85822fd6 SHA-256: ddcedfd4c48dd3f13c2f114d5e037f06a3fb45f4cdb4ffbeea9c92faefca2f75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to artificially boost search engine rankings or distribute traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f066e19424c88b3923e4c8f7cd0b0c54/56579166418.pdf In PDF document text
    • http://sziazsauto.com/uploads/files/zuwavewasikipiken.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/e6f2e6fe68dda077e100a68ead315e2c/34274767532.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/43545003403.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/30033818604.pdfIn PDF document text
    • https://luminex.pl/upload/file/1648360119.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/60813896003.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/71162396617.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/lfkhhp2d3an7lir9bb6d663udv/soxojovazajogugara.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3dcb140b194c439af804523918c03458/60688069098.pdfIn PDF document text
    • http://edgecs.net/documents/mukazigisaz.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608a88359c745---71101462657.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/jikipilatadagidiw.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d1314cff---mafasodepulagupalafetujo.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee6eaf273d---pekejiwopevamitakimokug.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/lulepizejimokonuli.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0b0f911734aa5f939a764ec9d12c17e0/22668488091.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/87519835546.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/51808345400.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/93793099865.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/nakimavokanule.pdfIn PDF document text
    • http://theshippyfamily.com/clients/57051/File/kowar.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad03c765d42---dejugopatadew.pdfIn PDF document text
    • https://jensbrode.de/files/file/84963532981.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0a88ccf2---dogidibupemoru.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/xorizeb.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/gg34jn38090kh50c894897uk14/99230949050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=digital+signal+processing+multiple+choice+questions+and+answers+pdfPDF 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_off0000b723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB723 11400 bytes
SHA-256: 2d8d4cdd248b4352f0e74f1515aa5980b3227bf38d943498dd7e85fa4aa364f0
font_01_sfnt_off0000d162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 15256 bytes
SHA-256: a4a00543fc736c6cdb2ef7b8b323ff2ffa7a97032d006b1b1c98428ec3f5b7c9

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