Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f10f62b4a26aeb1…

MALICIOUS

PDF

74.9 KB Created: 2021-09-25 12:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 410a42d804f937ea586d50cd7964cb52 SHA-1: e39f91d3b7c906d3a872a54b4f439f11de7b98e7 SHA-256: 8f10f62b4a26aeb19e35db014f62b397107340280cd61bf5a6fb06449031ef03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for delivering second-stage payloads or redirecting users to phishing sites.

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://chcial.ru/uplcv?utm_term=breathe+into+the+shadows+online PDF link annotation
    • http://irths.com/upload_files/files/pepaludijo.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/53658182561.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/kudezujibe.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133569e9525b---64749249806.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/legikeponibavatuj.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/xipoj.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/6477667038.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613305ec39975---lubegide.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/befezenutu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161454126f0e53---nuruvagotoxoretif.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/38816880742.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/ferejunenafozibovajinajo.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/fozemitosozixawuwofikos.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/36429964779.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3ced10d8e---vozulale.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/jetupubilujo.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/kanokuroregogivufuxoxiw.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/nokikilibudopoviv.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/70634931.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6377faf0---88975138219.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161422e3d663f2---luvitibakumoxafanus.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/50279222523.pdfIn PDF document text
    • https://maria-galland.ru/files/file/43833143116.pdfIn PDF document text
    • http://szhlfz.net/upload/wunexifekomine.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_off0000bc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1A 10484 bytes
SHA-256: 5bda7e2b57c41138c0fb9349c763ca2794e2d72464b9dd135747024e6d918ba4
font_01_sfnt_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 18840 bytes
SHA-256: f8ca361099279ad67250a73a6826af7c0d7168d7c3aa914518884c0702b0e06a
font_02_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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