Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf128574294669f…

MALICIOUS

PDF

85.4 KB Created: 2021-08-21 19:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39849927ad2049965340203ff4a61ad2 SHA-1: 515aed0207d0f1ea80d9d0b8a39b58c85be32410 SHA-256: adf128574294669f6685599373d78f662dc559ecc1c042f9542f81b9e7f3d31e
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and a link farm indicates a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dynasty888.com/image/files/20210528_155724.pdf In PDF document text
    • http://londonjip.com/userData/board/file/bozafufomibaruxejal.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/65441829484.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/93504461304.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/rurisodunixafowitumazum.pdfIn PDF document text
    • http://euroinstytut.pl/galeria/file/ripegikojabutidosokize.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/tuzalodiru.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ae31b8ba1da---53639645522.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ab679526e---sizakurewatikagijeb.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/55342332489.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca26f07832---damot.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/49ae2673bceb56f46c03b2aa0d4b797d/xazuvozukubo.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d188f324889---wavusuwuxumovuzazoxo.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/366b8bc8222765c55026e792c5692e2e/vawazi.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5fc54e244---xowivufule.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/likagezasogetekopojisowe.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/ximepejoxu.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/sawedugotar.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/dowafusab.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/xuwen.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c211ce5f2f---lubokigivizibizakesixaju.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/97796334620.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/denonanegefiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+barley+teaPDF 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_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CB 16944 bytes
SHA-256: 73c913e63d86f358c65f157de9ad61d1f453c0319b2b73d9bf7138ccecc2d85a
font_02_sfnt_off0001311b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311B 10068 bytes
SHA-256: 911f207266c6e4a4d04f852e8d48fb0ee8c758a7665c2e018661bb041fa05971

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