Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd6e99969be2078…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 06:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf8c627da5c8c22e894ce5cd41f6971e SHA-1: 2d0404d82b1594c5586139e79159df4a06bebabc SHA-256: 9dd6e99969be207866bd5f3472f080ce9206570e1216cf1d2ae6ea1f9ca201b1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farms suggests an attempt to redirect users to potentially harmful sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609a227905cca---wubadulisizewupofo.pdf In PDF document text
    • http://www.klimavill.com/data/editorfile/1783667953.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/16870961224.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/95973805253.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/26841797657.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109040102021380.pdfIn PDF document text
    • http://c-amc.com/upload/files/tuvupetumabelexanopomonok.pdfIn PDF document text
    • http://hydrem.ru/images/file/65790035646.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/xokepaze.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/77pj9ltd9n5ebo06karbhkdcd0/7198807187.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/41480241184.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/5fak8s146d1f6j4akr5fqbnv8h/84619475392.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/25768293971.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/dobogovog.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/palazamitinebexotevejede.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/30367807250.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/02db6d486d8c5e1776e64734a5243b60/39281041463.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761ad6c20b1---84637173771.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/seeea454n4hmaoafa17cuj0227/vetixejodaf.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/42913161984.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ed13ae968e5f14b1114cfd546c144d9d/riguzagereposojik.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/19970212051.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/77371598321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=tecplus+top+quartzolit+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_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 20732 bytes
SHA-256: 9addc2112f9b8dcdcf9ee597b078cd4e1eba2bd32e247c3a34be64afd3e981df
font_01_sfnt_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 10780 bytes
SHA-256: 5564c41893b3eeaf0aefbb4cfd69a5af9627ed8e32a63653944481daa33cca8b

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