Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23ceed7dfb8c283…

MALICIOUS

PDF

103.2 KB Created: 2021-07-26 21:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cfc82893af3b0a0f5839f336e6c4df5a SHA-1: 4cbc1806ed40fb4f91127413407202f13fb014e9 SHA-256: b23ceed7dfb8c283fe13d8abff1f0dd8e0282a0a1b97f8eacfc061943376b137
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the document is a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/4sh4iuvgdngvhq16d3badfkc7p/57281610072.pdf In PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/dowej.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084685f2757a---wusigosemaxetuxiviju.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/37676224714.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/rrqbjtce2b72ch5fk0tm0hus2c/metuzomij.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d0049f96e---mibakanikurevakezasaxapu.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/mafeganuko.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/pelofunozusofugaw.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084396a72b2f---38334393823.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a233f43aa2855da299ea0375e8ad7edd/fofegudavobeledamas.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/19387694335.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3f18492235dbd2b66d08fe7161edb073/xupevugolegif.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33146349d2---majowamisutod.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bafb72ecc---1059427868.pdfIn PDF document text
    • https://afayl.com/userfiles/file/pekonukojozazexumu.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160747405805c8---jetokitajekupefo.pdfIn PDF document text
    • https://activepymes.com/pub/file/9169945504.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/lowibiwunosilofagunasaw.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/79783786644.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/ruworipeta.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/87687880263.pdfIn PDF document text
    • https://codecs.roimages/file/67676588040.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/b6be84ee58eefc58d1ec7272474f897a/wuxutijikoj.pdfIn PDF document text
    • http://wohingltd.com/userfiles/pidopesoguwuvazixesabud.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/lenegoka.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/36679187093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=define+anthropometric+formulaPDF 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_off00012f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001479d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479D 10676 bytes
SHA-256: 55f58bb1d6b87e4178c00243ab20da9571cda51b1efedb81ee9a7cc51b604d1d
font_02_sfnt_off00015fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD9 17404 bytes
SHA-256: a6c0be96a4a0715f003e5bbae798ae35477cf80b98767117c27fdfd48b9f8f35

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