Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0a284a09bfdb48…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 10:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8f590a79bd63c6d349d46c302e474ba0 SHA-1: f6ad004c40c0d01c2f092d583cee40ead6464097 SHA-256: 4d0a284a09bfdb4898d78882632db1ea3160a809f29835a5c044923ddfcc8f61
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=how+to+scan+multiple+pdf+files+into+one+document PDF link annotation
    • http://kibbkw.com/uploads/file/zukusomijeva.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3835207181---kawebumasivad.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/96858124212.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/tatujavomakozaluki.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2f352f0ff---pezamaxiseraresosusalel.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/a3ed755cce7458edbd9bf1e4aa3f20c9/60441289208.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/4628267039.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/34394182009.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/ravaxenixapufure.pdfIn PDF document text
    • http://deforma.it/userfiles/files/foluravotudu.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/bugaxe.pdfIn PDF document text
    • https://belloverde.net/emailer/file/75054105889.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-9/20210509032259205708.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb051609b---xufif.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/25799121007.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/zanijuvosixatogizomeduzum.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f339f731f3---nufamiluwokefowurejaxuvol.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/64130315477.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/mopepo.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/gevevo.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/25123717162.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c5383ef6734813d9f8a3effe5cdb95cb/xukitasab.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_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 17604 bytes
SHA-256: 3b365b7370f3ffb0aab0105f32995b5ccd7e4a16870dca97bdde6f5692c38920
font_02_sfnt_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 10860 bytes
SHA-256: a9af96e986be624df956bb39a9a665c69a91466ef52e6208d56a2e1405f8531d

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