Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd95ad09fd9926d…

MALICIOUS

PDF

74.7 KB Created: 2021-09-25 17:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bfd82eba835c03aecba85e82b29e67a8 SHA-1: b16d30d09b39e06f87a15e1618f98c225af03fe7 SHA-256: bbd95ad09fd9926dc9ecab76e992a5506156608e804df87fd2e9d6a43d86cc45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm. The presence of embedded JavaScript, though not fully analyzed, further supports malicious intent, likely for redirecting users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=ocultar+barra+android PDF link annotation
    • https://highrise.pl/file/xuginag.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/1760952646.pdfIn PDF document text
    • http://rotang.net/userfiles/file/86084182012.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/l8cjshhaqmr41sh9qeq8gqigp3/luxizeleruvufab.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/59383829363.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/74690614935.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109231932218899.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210916102050.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/fokojozejavabuko.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/8280239261.pdfIn PDF document text
    • http://llux.vn/uploads/files/54166983982.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/gogisajuvopa.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/rovosuve.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/volafoveperonupowavokon.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7800bf46f291f6ed27b6779f55cc9464/67043854114.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/pukarukipopitufodisigov.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/90405810141.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/bumikowutebaxonigo.pdfIn PDF document text
    • http://keitbg.com/images/files/73177121288.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/46932700331.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/govudin.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/zipedumelore.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a62b85290646022675802574baeaca8e/gebomosibalutatikazunozuf.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/69793373146.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_off0000bea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 18500 bytes
SHA-256: 91e3cf9889264f98ccec0926b73ab48ec69b1c1baa22f5627109a49eaf3c67f9
font_02_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 10328 bytes
SHA-256: f5d5a1fe69adce13cccc51d144dde7a80bb7168deef80b89b48e69ac10a17778

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