Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d8e080f231e7ec…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 07:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c5aa23024e2fe47a717a4dc82702449f SHA-1: 067e326330ce32b5bba3e5ba8134d1b572dcd7a6 SHA-256: c6d8e080f231e7ec83cbca3548c07b25ce22724c1b0f68842d958b3db2dab439
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with several URLs pointing to compromised CMS upload directories or disposable hosting. These links likely serve as a lure to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://shethof.ch/cgi-bin/dynamisch/file/zudarisigituduke.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gsp7aa7katopv6pmk0lnqnlcs7/wafetukurusuvabonob.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/xobotelo.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/gozudu.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/45286936746.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/50135478076.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/71287137785.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/gunanisewogip.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/jemawotu.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/vedaris.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/89813552734.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/11528153958.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141635b44699---kitezususoxuvogamomuxanak.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/xaxurewigodevalemudipesa.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/19783350036.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/93340056077.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/84737763094.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109050017196691.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/winoluj.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/gomepi.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/sejiwukorefudaxubabi.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/14177768d5cb562395559e493ebd4b7f/risugof.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/60392761465.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/58473512013.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/koxaxozi.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/debubukubugarax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=new+ullu+web+series+online+freePDF 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_off0000b50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50C 15596 bytes
SHA-256: 45baad639d9101d3fb48dca25fbc4670ff269e64dfcfd12ec5b0b4d4ecf9feee
font_01_sfnt_off0000dc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 10252 bytes
SHA-256: e721f9c1e61df7b9958035d4e6ff428551865799a3e58b8b1635eafaaa5dc42e
font_02_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1