Malicious PDF — malware analysis report

Static analysis result for SHA-256 e938c02dcf1920d5…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 10:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fddbc2e02ce09b2cfe451c0b6ad11fc8 SHA-1: 1aaec56f40dfbbba11efb8d487bfee2f968223cf SHA-256: e938c02dcf1920d531fedb9d882b1a4d64986047992bedb10d895c9dd574ba23
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple URLs, some hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://mujeresenmovimientoplus.com/userfiles/file/47837092715.pdf In PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/91108663714.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3449f8ec12---35848288926.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/53509738730.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/mavilupakepupusidaruwerul.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4315087336---79861894777.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813926b8924---1940398212.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/fabupuwewibuged.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/lezawajagofebet.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/28057261668.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/sifokigoxejonatalen.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a22f3b2dc4137cd92c0e88330ea31307/kekarowerizawaturago.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094af681b376---64547250415.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/pisejenezuligiluti.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/mobomoju.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/wukisuxere.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/46ccf309cd11b49c833bb573661194a3/39647334949.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/dedafolud.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/39e1d4aa155da6fee06fb2c37aaaa4a1/16990326031.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/40685044193.pdfIn PDF document text
    • http://liily.jp/upload/file/20210722135222.pdfIn PDF document text
    • http://ewtch.com/upload/files/bosovomujobubodava.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f27b2fd079d1aa19bc23526cde624ba4/93159754323.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ad12c1e677e58bc34ba872aecae4085c/wulilife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=nor+gate+project+for+class+12+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_off0000d1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E8 17876 bytes
SHA-256: 8e41862d7b008dfc5da8dd3c9639eb7a5fd935b39d8e4e5f0684233c910e348d
font_01_sfnt_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 10880 bytes
SHA-256: ce4cd352f2247669e284d3e224ce72072f62a12555e876a00ae31b501d1af158
font_02_sfnt_off000118bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1