Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f27b3eae4df02e…

MALICIOUS

PDF

118.5 KB Created: 2021-08-20 20:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c1273a164d9aa743ad9f9e0498f03d3 SHA-1: d84114568b2ea8598efaa0b220d5fe7e51816305 SHA-256: f5f27b3eae4df02e0921c2629c1bc1cbbafb5425234c95298efe69f364cccdfb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://truckforceone.com/upload/editor/file/lejoregigakazem.pdf In PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/75997745066.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19fe10659944758b8c2cd0c9a829c709/dilakasupur.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/kkf7ic31bh7m65odskc9dbkir7/savabobedowe.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/340894be3344aa5c71fc58cddbbb5ec9/42624811294.pdfIn PDF document text
    • http://bscartridge.com/pic/pukem.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/dijasexewupifaja.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/vaxejomuwug.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/sufijusowudopo.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/mufabivafamekevamawa.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/kalolilak.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/namesavule.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c1e800ed0---27079515844.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160783390f2c41---46468123050.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/6462392251.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/gitisubibuxepovuvog.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/912372dc12e191aa19f7cd0b35146664/watewumeduliramakajigawal.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6d89686d5074feba98114bae0852de04/16053601587.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/titulalatajiruju.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/15859389941.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/vigitunaduworozivatuneti.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/satim.pdfIn PDF document text
    • https://aedwea.com/upload/foto/32991030330.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/9161050942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=max+horkheimer+teoria+tradicional+y+teoria+criticaPDF link annotation
    • https://lapdonline.org/file/xotonexotezotojewoz.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210705/16254152332346.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_off00016975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16975 18824 bytes
SHA-256: 87a1c558f80b8680e425f6c79aad9f9c82c9733d6a7c0a9eb7ddd18877f40415
font_01_sfnt_off00019913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B12A 10768 bytes
SHA-256: c470588ff438b16a5d25214069c072dc7edfded78df12f08334e3ca3c3dcf1c3