Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4e43fcd90f1c11…

MALICIOUS

PDF

88.1 KB Created: 2021-09-04 13:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ce6bd85d750ca4322c467a694cf1417 SHA-1: b3a99d08cd5557620367ede93415273d156d751e SHA-256: 9b4e43fcd90f1c11a059141da7977e899eed9c6b5934cd0b5481db45dea9ebbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple external URLs, some hosted on compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL targets are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://longarmquiltacademy.net/fckeditor/userfiles/file/74649020840.pdf In PDF document text
    • http://musicpark-live.de/userfiles/file/32795484525.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/4a4occ394lvrbgp94ve285n4tu/geboxofemabala.pdfIn PDF document text
    • http://leton.pl/userfiles/file/rawanilavirugujipidu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/54qip0fg0hp93cjhpcts1tn60g/vobofopamuxipir.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/91373807414.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/tp2jb0ekqb27hqfhu8ipsbg417/tugaxiwirewegizagodomonu.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/xokufarilizugidovamikoza.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/fibazipapon.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/83420297081.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/4562687231.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/39228484759.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8fa9a39a4a622c8645f442236e1909d9/77195512278.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/79752897835.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313975b3781---66453802128.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d2b1a9fa8a---xodawape.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/71954827909.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/96982322044.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/bemuvi.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/jaripivabatofu.pdfIn PDF document text
    • http://huiking.cn/uploads/file/181058557597.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/o3igub85j98fl0vaor00rjh1n0/nilinebawumuzubasa.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4770eac4e9---nakobopitaduberiloza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=quadratic+number+patterns+pdfPDF 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_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 10912 bytes
SHA-256: 04ce21aff13292dcf54a83b764694eacd38372e036922f83dc50c2039f171cd7
font_01_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 18464 bytes
SHA-256: 3683c0f3098aed6cb77d107d76aaefe0cfdac242a17912b7a077affd431ee5b9

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