Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5adf3048fc0df2…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 07:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc7452be09a6be786aec8836be1ac15c SHA-1: 94a9d074b5e5f640e7495b6888a3ad7db1660e9e SHA-256: 2c5adf3048fc0df28ea2c58ce9da7f856b70d5c77c04542204231df76cb8969d
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting it's designed to evade static analysis rather than convey legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9e8cc3b66c0b24bd1665ed37708df006/gevuretubepinanobobuvape.pdf In PDF document text
    • http://feg.vn/uploads/files/mevuzubogetasozejipez.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/venusowitusofosijojenob.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/sujuvejoteketa.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/fodekoj.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/xedimufusikefavobejal.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/wovezokivegefa.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/68634683618.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/51985665527.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/62425938880.pdfIn PDF document text
    • https://loctra.net/userfiles/file/kisabinojagugida.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/61872237019.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b47a1b21a134a0910a8205538fb8bd89/zegiwidifogeseresimuguzok.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec84123cf---rinonuparomotitok.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/vomofe.pdfIn PDF document text
    • http://sksound.com/userfiles/file/2275542552.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/6770222822.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210909000151.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/wipexabusujod.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/m8ahifbrubba6emhv9orvq918j/56391483430.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ddd247590419de719d07c834b4e739b0/paxudowakomagegiruzil.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcd0f5059e---rapujidiwowejibugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=friends+web+series+freePDF 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_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 17232 bytes
SHA-256: 1c3f3e81823069f012e05f66c3fc740f0e1a9c6d10f4f2bfcd056d8dab8b882b
font_01_sfnt_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 10124 bytes
SHA-256: 6e88a30c022ad093b5c066cb6b983f09000d3249c797fcb21d51a3783e711434
font_02_sfnt_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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