Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f82a7dd4cbf9a02…

MALICIOUS

PDF

88.0 KB Created: 2021-09-03 06:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1d678b214f29f4d111de61dbe41b786b SHA-1: b8be6a7090ea37f7ad30e098d7b8179ce0c55d3a SHA-256: 4f82a7dd4cbf9a02102bc6b8c2e6a9bc314fb02219cf21f568d23cf44ee46828
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like nature. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious or phishing content through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=barreras+de+aprendizaje+definicion+pdf PDF link annotation
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/9dd2e633ee14bff74317edb9624f985a/11270545235.pdfIn PDF document text
    • http://bogema.by/content/Files/lapinubetebivixabolenu.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca78641b86---93025228586.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/38779780186.pdfIn PDF document text
    • http://metapolar.hu/tmp/99854934570.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/konarolunalozitefi.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/bebosamowali.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/ruromozufarakumo.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hjj5ls4q3iplq07dbi2ngoosn7/bajopataroluridapona.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086597d12e65---vevebidowu.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/66656542082.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210501143524.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609883c50c1d5---86566775519.pdfIn PDF document text
    • http://fpole.ru/sadm_files/99959844029.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070853665f14---jatemixuwasekubutino.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/k2ak002mvsj7os6a1a3tubr2kj/zenoputopitezavebamofuwib.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/4imva25u8povhp63b99s64nkpk/nedadodefatesurib.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/3fd6cf00e8024d269556b19406e6e280/60923672471.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/307f505d5d9d32feabdb0f91c9d44de0/sujib.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/18aa7e40392f85fd9c8bd44a49670d7b/439527946.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612aefdf40041---pedigibenezesivi.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/zupisenonijofisizuto.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/67271969498.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f15a4a0d6442182b8e9b358320e2238d/10566170573.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_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 10712 bytes
SHA-256: d0c28d17d9167e35db510747247b55b2338c6964796650506fb3a5d46ea5c1b2
font_01_sfnt_off000109c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D9 18988 bytes
SHA-256: eacd602c9ff1ab523155973ab094dd75bcf476716441916de0af52783732333c

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