Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3c40f66939e07a…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 13:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a50e90724559605556d1e67b52e5e64c SHA-1: 788bb22202e8795cfc9042dfc2d808698be0d704 SHA-256: ed3c40f66939e07aef6566c851595817770da236443f89d3ef970f85ebae14c2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS uploads or disposable domains. The primary intent appears to be directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://milliondollardesiclub.com/upload_files/featured/files/58768055734.pdf In PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/bf32fc37afd2e5558fada385eac33a55/16527972619.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/g3omolecnhqb8a3smj79dnas84/petiraxub.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/22284870293.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/wubap.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/nudejigoxoxow.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/7ug0vj5rk2uhhuuf8mi74ic585/14934135448.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cde29e79a5---65815763735.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/wisux.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081322558201---zigagiwikatin.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/lijewunisirokatuka.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/7893130409.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/73209814886.pdfIn PDF document text
    • http://starlightcelebre.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/53075418490.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608967f49290c---bebikekudovovavubipaluv.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/71617910466.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/pelizokoxunebal.pdfIn PDF document text
    • https://landbar.com/upload/files/zinazugalitimurilavedade.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/wawavubuz.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e47cca218e---wokewogajavukofus.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608700c5127c2---sozusaresisamanadigob.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/2248791208.pdfIn PDF document text
    • https://yodobashi-church.com/83806202277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=aplikasi+converter+word+to+pdf+gratisPDF 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_off0000bdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D5 11020 bytes
SHA-256: f0ff8732b58ff43567eee37e1db7d40c9dc39f5d88330969f1359c2237f5f0b9
font_02_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 16456 bytes
SHA-256: c9e300fe26b79307fd3315323e117a11b2551e521083fe70e53a7c5c8902df9a