Malicious PDF — malware analysis report

Static analysis result for SHA-256 d606f6761a973262…

MALICIOUS

PDF

72.6 KB Created: 2021-09-28 03:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 747179f13865893cf72f89a10dbbc7ba SHA-1: 72765f661869b100032f2d154c25592fbcd3ebfe SHA-256: d606f6761a9732621be25d28afb5f4e8d9330993120e6e7f76e89a2cbed001ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=moto+x3m+game+play+online PDF link annotation
    • http://zenobiacultura.it/userfiles/file///migadorexumijerulusele.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/68149192623.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/2745629055.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/28423164717.pdfIn PDF document text
    • http://promise-land.com/upload/file/60322177372.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/fa31585ed80f1961dfeb7af1e0c396bb/17456023751.pdfIn PDF document text
    • http://canoeing.by/pics/files/bapadararesadide.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/fobilo.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/mamedefek.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/88359222170.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/58271052527.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/82748922961.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/61644482248.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/gerinuxemafuduz.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/kosozilupowasoparonev.pdfIn PDF document text
    • http://nwmanagement.ru/generic/uploaded/file/daxegewabutupimeni.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/80416089642.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/vikowigarivilipites.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354544a77f2---galuwutumuzidaso.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613613e98b5d0---zotanujer.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/95351908214.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kawizafi.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_off0000b5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBA 10708 bytes
SHA-256: 0dd94a9f58a00a00aa2339675bda5918d22414eff2a2b026d217da806ed33059
font_02_sfnt_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 18124 bytes
SHA-256: 7673c8031116be911542cf91329cfef690542e44b0774cf98fadbaa03a870012