Malicious PDF — malware analysis report

Static analysis result for SHA-256 14bd5aa0acbed2f0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 04:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8add8e4da63f571aec203b8000cc1783 SHA-1: 27ef58945a5d57cb3ac3624e8201da5571982783 SHA-256: 14bd5aa0acbed2f0b95730c49d916c7a1a0cecb2a3c8b06696adcd31f052554a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=adb+and+fastboot+download PDF link annotation
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/daritenapujisufona.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/82636226789.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136818d4f336---wododalelalaro.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/zubixuxedenulamazugama.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/pemovig.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/sorozuzetatemewefijemuj.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/kosiwowivonowovalirewub.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/lagegelivil.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/fudusiwedugozibukame.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f51fef3f4a---85255239809.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/viponevebezavazev.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/gapododekulubud.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/nufilarut.pdfIn PDF document text
    • https://31app.com/userfiles/file/litobuliso.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210901215744.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/43211827273.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/8d399a33c2a8278ced2a4ca76cf76e41/96090626153.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/rutag.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/puvojip.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/vunudosanixedate.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/tiridimopuvasa.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/rugifexu.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/44993586661.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb8a2e9c5f---41672705018.pdfIn PDF document text
    • https://superpart.com/files/bubidofurazesekewurameso.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/32345110833.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_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 10228 bytes
SHA-256: 1169ba238a8fe3da31142c21ebd183b7a6793b246ee9c79f06b0322b6e664a6f
font_01_sfnt_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 18468 bytes
SHA-256: 94a1e1e6c8ecf38ec711409ed44c045b2603e80d82f2b3e3f9f4505c1c90ef02
font_02_sfnt_off00012abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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