Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c22d85054a7741…

MALICIOUS

PDF

89.1 KB Created: 2021-09-18 01:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aa547e1dadaeab478b9329186aec6d43 SHA-1: 7e3b80a332b5bf136b59c256d01b09c9301da0ce SHA-256: e0c22d85054a77414186b1f324c0458dac001a6df895386f54ba20dd4a8e9822
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=household+items+that+start+with+the+letter+g PDF link annotation
    • http://urs-certification.com/gais/image/file/56964649665.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/kadepulavop.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/radufamizodaw.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/fufipumotemokali.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/nigesor.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/11941950514.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/dokawokatirajajum.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/20233875851.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/filut.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16143a74ab6efa---lumubogufuwiganupow.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/12282441299.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/62684350468.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/ferazepiliwasowoge.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/4022816608.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/64506713166.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/90236540750.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/57864358602.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385d0a619a9---9654115700.pdfIn PDF document text
    • http://mousike.it/img_ins/files/fexuwolonofofegawavufo.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613aba3d1ab53---pajinufapumuneremijotulus.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/kakoxekuluvefuvojo.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/32031135088.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/62816188048.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/wejabip.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/wuludaxivobimapejudew.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_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 18684 bytes
SHA-256: 3b67284e59b6df76362e993d6d95c737afb725bd63aafb25be8c4bcee08fbac7
font_01_sfnt_off00012526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12526 10768 bytes
SHA-256: b6c68403dff6aecfbbcf8843ec5ff4743fce06ed33333135d2eccb1cdcf38b81
font_02_sfnt_off00013dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1