Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40723442fb195e5…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 17:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9bf9c9fa2b79e4e881224e4197b5b76a SHA-1: ef98e9f7f3879f51369fcaa4b8794aac5beda065 SHA-256: a40723442fb195e5f5b008a99241d99c475d2e92ec354f90b87abb2df9d8a492
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress uploads and other disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://cructi.ru/uplcv?utm_term=viper22a+circuit+pdf PDF link annotation
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c69690e2e7---120036040.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/cb58d66675e5358b60254cf1e29f86aa/xebit.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160941de70b977---wiveji.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/migifomoxolokaxode.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/88408579220.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/49050387973.pdfIn PDF document text
    • https://tch.lu/files/files/48857334462.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202108301257389881.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/05/file/21350232990.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/59812162736.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/89846774225.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e86374c46f8ee9b3aebafe5fdde9108c/58362052312.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb3303927d---5368199860.pdfIn PDF document text
    • http://minhanh.com/files/pakipifatuvebomajatin.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/o7rlielf126ccq49cs718rdt47/volitegatopewisufovimux.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/19239708018.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/v0p3lr7spci87m6lsa1ertf711/39941623578.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/datotodura.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607535687226c---80476141476.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/l27b4a3a5gpmmn6vdgbg3tu4vf/butofatazewisajodenivevu.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/18667097401.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/13612977417.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_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 17016 bytes
SHA-256: 517f78b0530b10c23a727a7f19c4a2fba197fa04619b8bf8d57e332d8a0fd46c
font_01_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 10364 bytes
SHA-256: 4c127060d93e3676c5a38fa95258e3fc54ca870a8b342668cd079fcfa7dfffe1

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