Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd089376515e597b…

MALICIOUS

PDF

125.9 KB Created: 2021-07-03 12:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 74f3acadf864a8e16ed3a3e2ed354692 SHA-1: 510800fed17131841ad24806d3df15bbc81f0537 SHA-256: bd089376515e597be5f19a1b40be295995cb5b3a92bf4b4bebeea564169e15d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for executing malicious code. The sample also functions as a link farm, pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. These links likely serve as redirects to phishing pages or malware download sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5b33c8648110b607b3865c8ee7e26f1e/vakejipipikomogapavoxe.pdf In PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/6badd69da7480163c12bfa929bdaf1b8/jisemonibesibura.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a82b41da0ba---31973887657.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/kisuvunojuke.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b348519c4a---sagafesumekabawezebome.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0a93dc4d4---mujawabesisenapukuzo.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861e511078c---sidamupodeluk.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ace8aa292f9---jirodowusovifinatazipab.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/qupsccat76r6ri4sp8qd330va2/65013045910.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/966d12bc336bb5d36fd7c7d1ddc01408/7033640218.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/kawubafenanoroxetemima.pdfIn PDF document text
    • https://rivnerun.club/images/files/terevisazufulexevusi.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/44030487382.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ml6kdsr3r94jo7n0fg4s3v7630/12439056163.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/78268458295.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ahtbvpa32fggtqsusog06pcao7/nagefufob.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/famuloxogu.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/24617446169.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfd26eca6c---noripawupawevoxamusaj.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/1300005679.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8605d529---bavikukemit.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/87550166655.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c92a72508e14d36348c9353139be1db/xevimofawox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+chemical+symbol+for+sodiumPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e51c5c9da---84081591433.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_off00018525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18525 10856 bytes
SHA-256: 362312aeb9d7c17fc0744698155ce7d3b28fb3a4771f52143d69edc9998b3d8b
font_01_sfnt_off00019e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B646 19916 bytes
SHA-256: a05be31d3c1e8faddf7d0a75550ea195f684a2b273e3fe4d0816aafa99c363c0

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