Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5017da953c4e494…

MALICIOUS

PDF

89.5 KB Created: 2021-09-11 10:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30b16261bbe857e0f774a9be4daf4ee6 SHA-1: a702ce9aefe9e07e15928d61ccc82cb57676ae37 SHA-256: c5017da953c4e4942e010cdb834cf90d84f55a4a7fb051a00d3fe4bf49b5c5bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to domains identified as compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, but the link farm structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://mineraux-et-lithotherapie.fr/ckeditor/upload/files/68390741247.pdf In PDF document text
    • http://daltan.hu/userfiles/file/zatagilekinuren.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/62140568635.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/vanugodasinofab.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/simifetiguwizi.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/sogikubujagerefo.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/pemuzejozolar.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/2293578871.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/14922896412.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/gifuxilirigeganuz.pdfIn PDF document text
    • http://torgoborud.org/images/file/38333334083.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/zatefovolivuze.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/50852181326.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613173146fac5---dabej.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/73114740130.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/12decf5c8f94383c5f7a6d4b5f9e1718/vuxinuloxigul.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/22082323133.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/54710689395.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/rerunu.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/52224087799.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/19299207353.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/1cd89912061709e9a5e05a8971aef8b8/98423623134.pdfIn PDF document text
    • http://traviet36.com/upload/files/vimunuzesisi.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/rirunevifafojuzuxixam.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/73216820656.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/18267852933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=is+6+a+prime+or+composite+numberPDF 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_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 10848 bytes
SHA-256: b92ad723d253c2465a33913ed9e5be8b735219f7a53bf2a854a82240d223dabb
font_01_sfnt_off00010da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA7 19384 bytes
SHA-256: 4d78189da016550232a634139e9c22be4242cdb55eb9d750a202babb7862f015
font_02_sfnt_off00013fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1