Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec381860e6b6d83…

MALICIOUS

PDF

95.5 KB Created: 2021-09-07 10:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 57d887a241b02575010d8097d9c8661c SHA-1: c105832f105232c9f70b651d75ffcddb3d6fc8e4 SHA-256: bec381860e6b6d8315e4cd2b7671a488beb41a38aa3efd8f6abd040d570bfa3a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b536eabec2e---20952259836.pdf In PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/97651697442.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/pevekibimabomivaxes.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c92e54ab5f---vetarazubu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6861ad3cf0---towob.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a706dd0364f---jibezepepexodikukedi.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/2gec3lvtokus0ruq2b4tlk97uo/kajuze.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/k9ae73vm1387srvqv9maps6d13/58972865928.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/91537092156.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/pujuxibobo.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/37273853357.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/zabomajowod.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/dubalaruz.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/suxitebukifiwadodonix.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610aadb074101---vaziwud.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/fojikegigoxisoramubokovon.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/riwakagotafoka.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/0e732ecd81aceb162c7bf52f56a80083/xuzovexufuwebunovexetuwos.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/86083321c6b2d3ab61187963024d35d2/51724177453.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/buzuzavi.pdfIn PDF document text
    • http://www.bandungmesin.com/file/28964140882.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/jupetadifilavomavusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=fracturas+de+tercio+distal+de+humero+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_off00010aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 10860 bytes
SHA-256: 8e0d372b36f1593197ed75ef77f441c879238db4fb063b6500cca306f2366b5a
font_01_sfnt_off000123b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B7 21008 bytes
SHA-256: f06f68011bc92ac77bb8c171742d5f2e4a6929bae3c6ad59edc2e0f67408eed1
font_02_sfnt_off00015835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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