Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fa78646c6fd5e4…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 19:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8db5162c0757542c45c0f59b1dd9d225 SHA-1: e7789c6a092701cb08587a3f1d693b14eeba6ad6 SHA-256: a5fa78646c6fd5e43259214ee261f3a619a7e0d3fa2ddac504ef3c8fef24b753
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, suggesting it is used to distribute phishing content or further malware. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bbmeti.it/userfiles/files/tabepebapur.pdf In PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/d6uera8hq8uks34jsdv82jrm19/geboxavam.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/75ropkekbsdu02tt2pmj283uj2/jetevujirekudaxivon.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1612d5b5312e4a---mirexo.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef0b3d26b9---68671378310.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/10248624905.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/disumixavadivapawonodufem.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5d0b245ee2a719e4c6976a62058714ed/xafosig.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/85805004848.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/kidil.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/14973744902.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ad90f6ace9441d9216b3cd54895cd6a4/gozov.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/mefuduvogez.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/mesutajigesalizud.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a724f918946---17469239676.pdfIn PDF document text
    • https://campermagazine.tv/public/file/zaxuzake.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/lujesuludadejirejagupo.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/13130635673.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-25/20210725162555454730.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607545d04c647---2896562863.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/1867dab3d992faf024c09f9e4b3e28d5/98133398339.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/40092161519.pdfIn PDF document text
    • http://moristas.com/userfiles/files/11194135066.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/67273986755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=grammar+exercises+present+perfect+simple+and+continuous+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_off0000d230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 11020 bytes
SHA-256: 2fa1cd7b89997c2e05e117f7621d20c642d1ebfc5a2144f159395ab471e50f6e
font_02_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 18220 bytes
SHA-256: 3d9bc922032a9aa761f68318bca83872643fea81d13e5599e811e45d882b9101