Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b62135745fe030…

MALICIOUS

PDF

96.0 KB Created: 2021-06-30 01:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 614305ff51ffdc4cf8d4f526d244349c SHA-1: 7deda96d4d2ed2b3f32ef1933477a51cd4472397 SHA-256: 83b62135745fe03006dd8a30baef3f4d955168f9561bae0a0919ece9fd577fba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ketchas.ru/uplcv?utm_term=how+to+draw+a+rose+with+pencil+step+by+step PDF link annotation
    • https://twfern.org/upload/ckfinder_temp/files/20210526203008.pdfIn PDF document text
    • http://yuli-china.ru/d/files/pitigexifebijifonusepe.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/tafuj.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/aipi4n842mhsb8n86infdci465/wasunimixowetexutoji.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/vututusigogexupuxojolu.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/66192233747.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/358aea5e419ab288ba404ed182f81a93/lagetunusazexu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4f0e16313---72187838080.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/14197280145.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0de3423954c1686dee4dcec63a2f818c/33314271492.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210517050059.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb82ba4673---nazajujonov.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaf60d055a---vuwoxugubosizojofaroje.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/h2gdtd2qamu5eoioor8p0p3p72/regiga.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/nufosaluw.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d00fdea95---viwidizegawedevejuwuwar.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/5640494438.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/wewoxil.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/245e731b3e3e01520134484b2472947a/34069690002.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/0vn8ktdjmgp0p3qsi9gh378ec3/pewonofofi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/6adhrs6a64m5rmm3bss776bp17/zefinixadanazilireber.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_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 10940 bytes
SHA-256: b9ff1eab733b343333a09d61d52973ff25fbd1f975f42aa4bcec8a3aa6f19c91
font_01_sfnt_off00012e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E63 16444 bytes
SHA-256: 8acb5912b241621e16db7925f4b653fbcc3d467553d144423b93edce4174aed5
font_02_sfnt_off000158f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.