Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9254dd40cb1d8c…

MALICIOUS

PDF

76.8 KB Created: 2021-09-22 14:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c6b26685ddd08920312d032a36b3d810 SHA-1: f34b4ff13cb2da01f8c3db0b0683b494cb5c720c SHA-256: ca9254dd40cb1d8c7db84fe776f60cb85128f3c2704add49a89dd7f6b764b179
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable or compromised domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ans5680.preneed91.com/upload/files/guragabezimoturedopomazaf.pdf In PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/panabola.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8e6861cf08cce47c602b2024719b0dd6/35396964057.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/6458918090.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/76399418690.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/doboserofutixolovejoduba.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/95073517368.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/kunipifesaba.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/fupadef.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/pipoduwoxutuweje.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/10017669709.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/tivazufatofug.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/ditibizodajuwije.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/89775371328.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/627bff76ac078d764f8ffde006e3bd3b/47257780946.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/97935342234.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/mokepefugiwiloragirejur.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3ecbcc90ed3483f1020b1d4ae2901d8c/susitovizakotaduwepebazan.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/53134719656.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/satipuw.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/laborif.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/vogis.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/gasijus.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b18e3e40ef---63329174110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=play+age+of+war+2PDF 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_off0000ca4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4C 17136 bytes
SHA-256: 625fdd7b028365e12ddfce9886c174db125fdc875cdba0f1d038e82c497883c4
font_01_sfnt_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 10248 bytes
SHA-256: b9245d73d42f6a84371d9ac962eedeb2a0658090af9cc9097cf46496797dde07
font_02_sfnt_off00010dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1