Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6767f65bc482cad…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 14:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2843b97569e474228464bc2e971b7343 SHA-1: 214c73dca212f771e9ba5b44cfa420640fd91ac5 SHA-256: e6767f65bc482cadfe22f226f3c7dce93b9e2611496265948cd8c4ce0290a05e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggests links to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://crewmak.ru/uplcv?utm_term=famoid+get+100+free+followers PDF link annotation
    • http://3e-recycling.ru/app/webroot/filesfiles/386502809.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1faa1a02e---66519805221.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/a7eaeef2481e8be1f0354c77b23ebab2/36011388745.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/66431197923.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/jopezenewo.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/surawuwekulawuwerisaw.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/savona.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/mejigilukugol.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/pebumemo.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/89785840133.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/bavujifojitu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493f2458516---17213666814.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/34963186989.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/73228497306.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/20169620980.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/maxinubinobibesadaxeko.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/velup.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/4901960954.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/84510588573.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/viqk1m89dn0lviebogrbh6e33c/suroguwevu.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/70711864229.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/pejeno.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/45420160581.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/85420991998.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/18975026118.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/76224205811.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/55082306333.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_off0000b581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 16956 bytes
SHA-256: 79e443449aa821185990946c010c88db83bbee9ce63e2693c8f109a677d64f77
font_02_sfnt_off0000f8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A8 10832 bytes
SHA-256: 5ee313dc4410619ec5111449560568d48485c48f2d62a057afd66d3169b6f965

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