Malicious PDF — malware analysis report

Static analysis result for SHA-256 27147855d923912d…

MALICIOUS

PDF

72.5 KB Created: 2021-09-12 18:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 905fb5d7dbce6e4fd657480f929caf5a SHA-1: 2e855d518299ca2c0274c80c1e3d91de12ed6d5d SHA-256: 27147855d923912d572a0e08c2210b46444fa3398b4e4f6343fe158a507f476e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns align with common techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://smidgel.ru/uplcv?utm_term=best+torrent+downloading+app+for+android PDF link annotation
    • http://sjccgy.com/userfiles/file/bupapisixilujokubatiwab.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/599bd1c50b15be3039c1d2a230c30ea2/88501202680.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/62504252885.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/p0mg04f36vr8j37d4esvp7ksvr/41986910586.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/dulazexatagivigubojujuked.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/gelaluvefirilagovefebutol.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/69480357984.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wefavopewajonarakak.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/21346855692.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/102046868.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/24509430362.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/laxipim.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/fevubovuzilisijopore.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138712462397---saleno.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/32473439739.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/nuzawitivubavu.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/55433676654.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/22247321887.pdfIn PDF document text
    • http://talleresjpg.es/img/file/fufunokekobalewiwodif.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/30200584541.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/fexiw.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xisutegedavuwaduse.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/31746996727.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_off0000b8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E3 16472 bytes
SHA-256: a8d7b1802f907565546add42d7e94dc4324e50461e57bd2a19ea7b6212274deb
font_02_sfnt_off0000faec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 10812 bytes
SHA-256: 8d8c1befd7150786ec46b4096954c52b77a0c710beeff185667a4036f732069f