Malicious PDF — malware analysis report

Static analysis result for SHA-256 dccb11d59f584d89…

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 04:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4cc8ff5cab06bbd19b39ba208250288f SHA-1: e6b150d65d79a3ff48e6174b96fa5a60e6177074 SHA-256: dccb11d59f584d8941599019815e03883d1ba014b27691a358a975a60703d5af
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://ristoranteibucanieri.it/userfiles/files/32836472742.pdf In PDF document text
    • http://parfumland.sk/upl/jozuw.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/77159075754.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/juzena.pdfIn PDF document text
    • https://deepex.hu/hirek/files/fusodobo.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8f650ad4f---miwava.pdfIn PDF document text
    • https://kimcert.org/E/file/87899023749.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d565aba37---78845775650.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136656af0ce5---55917596837.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/90463582417.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/vufopefevaf.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/68995423019.pdfIn PDF document text
    • http://mgrima.com/files/file/sijediradoxemisanilusogi.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/56849911015.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/22003041069.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/zenarumapaketikotejigu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6df4f4138---momuzizelaxonaveropemazad.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/45410475881.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/lodurofojoberetezakubibin.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/24064751486.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/36513412904.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/20137820390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=kabhi+khushi+kabhie+gham+full+movie+download+hd+1080pPDF 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_off0000c710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC710 19396 bytes
SHA-256: f261c41cdbd65e1e8643007bf60dbfe7a28c4a3b0e607f812dca80f5b5d8202c
font_01_sfnt_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 11604 bytes
SHA-256: 36d6c340f32b8060dc2d588e3f69596f62888793bb02de8e6f2ce9d9ae0e5cf8
font_02_sfnt_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1