Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dde306b07f66ed…

MALICIOUS

PDF

83.4 KB Created: 2021-07-23 12:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3449059243d124898f223048d26fdda7 SHA-1: 15ce1e80db11fe87e8324718d56787a6243f7222 SHA-256: c8dde306b07f66ed2c0e159fc27c1a969ed58204bba077f0793cf5d86a9e1ecb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute phishing content or malware. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://omgmediatank.com/userfiles/files/mazujudidep.pdf In PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/032e4da56ab261dc3284881ba4177f76/kuralogumebixanukike.pdfIn PDF document text
    • https://dhesient.com/media/5895343015.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/27980741289.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/24380774992.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/guxobofameluv.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/rurojorejowez.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082a68014e46---miribe.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/iht41jt5hbfpj673i8pamgom22/junewejusulu.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/31dfe91e9b0f432956e6269c4cc7c549/nizefanekite.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/15909979474.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b41b5ddc4ac---61858343703.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/91638591867.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef2dad3d77---fodarujoxewulipijinagebo.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/45151390033.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5e45eed8d---45063808454.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16075b26a5f190---rupugosimejogemi.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/tusiwopomavaz.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b0f54897e---84727911629.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/zasijezugekafifepozejes.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608266f61a333---71002536521.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/guputikesazitadavof.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/42502157581.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609677a614e58---gorobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=words+beginning+with+soft+gPDF 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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 10644 bytes
SHA-256: 5768f10d61ac3240564adc239d0749c0b49985e69f98e2f993b25a1a42b725ac
font_01_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 16872 bytes
SHA-256: 9f5257384ac58b370e12143682c254292a642b64b7c127d56b97265f7dc9d993

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