Malicious PDF — malware analysis report

Static analysis result for SHA-256 643a4fee59248567…

MALICIOUS

PDF

88.8 KB Created: 2021-08-09 19:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd7e72fe709b91b17499478a0f52391b SHA-1: 67a335111335db68a853cb41d9d77b2432bfeb6e SHA-256: 643a4fee592485673fc923118d3356907e2e6ce75f0736eeab1f43148539fc2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on compromised websites. This structure suggests a link farm designed to distribute malicious content or lead users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://inwebjor.ru/uplcv?utm_term=hp+officejet+6500a+remove+printhead PDF link annotation
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/9a215e22d5303e28467b9449d22ba04e/nurexazejogi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/48819225344.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160ad05e4942db---89875592158.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/8326312238.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/tamutaxalunotalisomovi.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a24e439a6b7---meweludilodukureriken.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10c48f3bd---saxuvamumilojenuwep.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/94f0b1d816c0cd2d0d61a3d9bc25d93e/dirufefemuxumulov.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/lezabilitu.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/47020374242.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/sedinevavep.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a6e73a40e---tuxexajipegoj.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd15ae863---xudululugipozi.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/lilix.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/54837048680.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/17fc0f61f3879b0809aef23fdc343b04/penovesipisewavoj.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/jalima.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/102e54c1312857ba596a0cd3ee9f8226/sinoginaxonejukumowavira.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/dusepejeguwokawazo.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/popaguba.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/68658b555061573ac86c6b6a268a190a/livemixororotugat.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/zibufute.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_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 11280 bytes
SHA-256: a8248c4f91da85554658b9a29e7529c67dd8f114fb7c667fb2c693ec993ae375
font_01_sfnt_off00010baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 18628 bytes
SHA-256: cf25cb0199a42cb5091780202e233bb06f3816a8365372d5a2cbda5c3e8cc46a

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