Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc21e2300c43515…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 12:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e4d3c272788df87a2c0bcdae8ac10e6 SHA-1: df4e1f82382b77a6791fc4d4d995d17731feb99d SHA-256: fbc21e2300c435158a615fdf3314d8e8ff1c764cea3c1083281b825b2b2a3e3a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack pattern observed is the use of a PDF as a lure to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://propellerclubsandiego.org/uploads/files/vewekipozusoraxefitu.pdf In PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34e882911---waronavisivigeta.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/vizigomizusenip.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611054afcdcbb---2262237698.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/fdi46lkcgkqos5k37si5jq74t2/21846903185.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/90930749154.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/30294457907.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d3bc579e4---mivarififotigugukesiroxex.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/f14e23734fff8aded2d19801c1a319ed/daloxibedovijege.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/667iumji55mngljqujc30ts66r/dujutipojutuzelogiju.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/hserllrgkjff4da6cug1m90510/2059565392.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/a6ac70259e9759dc33926cb4731b100d/81905340459.pdfIn PDF document text
    • https://rotherelectric.com/files/rugew.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/38683465098.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/43520235698.pdfIn PDF document text
    • http://dd-eng.com/files/files/xosus.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/34971722359.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/fatiwerav.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/7e0ia4gdhtu17niuqf01vcq9rr/zelanotoxemekame.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/e14fae5d0ccceb5162d10602f2e406f8/siverirurifutifugulogib.pdfIn PDF document text
    • https://brs.jo/userfiles/files/fulojofakuzepupotazijaguf.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/75436998726.pdfIn PDF document text
    • https://fultoys.com/userfiles/rotijativas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cuerpo+humano+para+ni%C3%B1os+de+primaria+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_off0000cb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 18808 bytes
SHA-256: d1c20e650f506938abc0a5eb3e032488ed7f17510bb433337e8127ccdfcbb3b4
font_02_sfnt_off000112fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 10956 bytes
SHA-256: 5888bebdfbf8499a484cbe95514a4638897726531457941cf88b73f53f93adf2

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