Malicious PDF — malware analysis report

Static analysis result for SHA-256 66550bdc6703f9db…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 02:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f628d4933efaa98cf9d18070970fcaef SHA-1: 2212f229d74e7c00eed3fb8f21429701f7ca9eae SHA-256: 66550bdc6703f9dbec89c2e4ff2c3529e6c9719d47c049399bb19eb0b485ba44
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'LOLBin' tokens in the document text further indicates an attempt to execute commands or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://charmingcurls.se/upload/file/94631157817.pdf In PDF document text
    • http://viviapalermo.com/userfiles/files/diwezazafasufeseba.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/89663428045.pdfIn macro / runtime command snippet
    • http://hoachattn.com/image/files/74585672396.pdfIn macro / runtime command snippet
    • https://jeevadhara.org/work/london/userfiles/file/31925074666.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/32133833247.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317e8c1feaa---gogowofatezabakuzibul.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/59232677896.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47ba8e3e5---80376119979.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/50875695943.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/bekivulopokozivu.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/8128624371.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/xujoroporapivaseta.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/roxobalakajeligusimafezof.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/sizagotutilimebilo.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613032e23c109---kajiwidov.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f1f1718a---34324378136.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/717881432.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/93951142586.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/moxoper.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/jomoxiba.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/lupinevojudonor.pdfIn PDF document text
    • http://viviapalermo.comIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+update+samsung+galaxy+softwarePDF 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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 11144 bytes
SHA-256: dc2411648efbc33e04ecf065225c38ed627d7ee13a22fb080e8f56a6d39dad71
font_02_sfnt_off00010e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E87 17760 bytes
SHA-256: 28a2691d66068f4c4d4bb2c919512e47089eea0214e2613af39d0d63e3daf5e7

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