Malicious PDF — malware analysis report

Static analysis result for SHA-256 911cbd92d99a1aaf…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 01:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b7940dad49b3ba37b51c6d30a53ebf0 SHA-1: 8991b05a9a09df1f56900d4a2db34463a0c6f363 SHA-256: 911cbd92d99a1aafac98d44ffd6305333f442a2361af0d28939c70c675951435
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://nomylo.ru/uplcv?utm_term=yumite+barcode+scanner+manual PDF link annotation
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983ed6413ac---85703380563.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9b3af0883d1af083075ea97285d5036e/67765285711.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/56324651866.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd2f38d4ba---fudepurinisu.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/masulevulivuwozometatepo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/cd100267fcbb5fab02e5485578dcba7d/lanujimuwezobaxamikufor.pdfIn PDF document text
    • https://sce.tw/uploads/files/6109c8a174032.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/36778814879.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/31544775552.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/94652416314.pdfIn PDF document text
    • http://learningkey.org/userfiles/78933067862.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/rukatixowewifenote.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/931e99a24d0e595dfb60621d926b98fd/sokamasidixewabavibuke.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/695418b7c5f0feefa37ed8358494ac20/ludakozurodiwaretusitop.pdfIn PDF document text
    • http://timesofbangla.com/uploads/files/92461057219.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/joloxuzekekamigujoto.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3cc75e1eb---35218849082.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66ab0a68a---rekonogipagimakarip.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/6jjmteq3l8hf82cm0selhubto2/legodamuravutejaj.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16126f548c7d2e---78165355854.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/55824818453.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_off0000cbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCF 10752 bytes
SHA-256: bcb616ff118204fe77fef64f093bb66550e4e7f429453e767d3ecfeb9812fb65
font_01_sfnt_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 18440 bytes
SHA-256: 9210c60853ee2969a6974ee446222adf425ae670577e561fd01d52963279783b
font_02_sfnt_off000114c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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