Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9708dba1e2ab882…

MALICIOUS

PDF

71.7 KB Created: 2021-09-24 02:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4d573201c3d2a6fe3e9678462dd93f8 SHA-1: de06d1142a2669469cf357775374000f789e0658 SHA-256: d9708dba1e2ab88227ad09c1e74655d5c4a444bb9e8810306367db6e6ce90631
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and compromised CMS upload links suggests an attempt to lure users to malicious sites.

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://inwebjor.ru/uplcv?utm_term=como+resetear+un+samsung+s5+mini PDF link annotation
    • http://abwcolley.com/uploads/files/zotosapekojijiwam.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/32199623024.pdfIn PDF document text
    • https://windsbs.biz/files/file/jepeme.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/pbt49tv8jpk2fb7kvc3dbnte75/tozibakogetofurixubis.pdfIn PDF document text
    • http://parfumland.sk/upl/17858659749.pdfIn PDF document text
    • http://gestioniarmatoriali.it/sovexidugam.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/95931064873.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/mujupexutil.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/70348072747.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/20392478922.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/a78og3puo2jbalhik7gcpdt4tq/zewuzoxetaxobarib.pdfIn PDF document text
    • https://frisch.ro/files/file/toxeniwuve.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/36713608149.pdfIn PDF document text
    • http://inistor.com/ufiles/files/nimimu.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109041520326490.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/kewisekerabesejexexa.pdfIn PDF document text
    • https://inarsindbari.org/uploads/lafifozabidotedexakuninot.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/rawereropomalur.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/zukikipuvumibepovo.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/93051449497.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/3aa21ca0ae9af8c54a19dc1d71e00e1d/mulekarimofejizuru.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_off0000af4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75C 19704 bytes
SHA-256: 53db492f3fe9c3194edd27bbd06d10f2a0b2d92a3a1481b589a147e3d74e94db
font_02_sfnt_off0000f917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 10668 bytes
SHA-256: 7e88383dfeae89e4e78cc547d919328f05f710d22a2dec10acfbdbc93b632098