Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4b6dace6666fb6…

MALICIOUS

PDF

82.0 KB Created: 2021-08-24 09:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a524072ced8230664c4a6c2d6a85d2e3 SHA-1: 15ceb73eb3891d00c7f55f0c66af510165bdde71 SHA-256: 4c4b6dace6666fb611c9f8e1f7c891c2305e529f98950c33f4acc91e32e7e9f8
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URLs suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ippinnudon.com/uploads/files/49964788433.pdf In PDF document text
    • http://massarentearchitettura.com/userfiles/files/30025496683.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/nukupokavunupelonesu.pdfIn PDF document text
    • http://falerisztika.hu/tmp/josedeporirimikepubuwiwu.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/2816502900.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/bejakete.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc50b3708f---pepuvufuxoforaxedola.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/butojina.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/sadujusa.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/17520962736.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/vixinawunilexejuw.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/kavevuzaxetuzemij.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609deb463dc48---gulexuwojoxofibali.pdfIn PDF document text
    • http://whatdwellswithin.com/file/57797482623.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/12101772599.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f22ece292---vobojelivovosusomip.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/mmv2udc7vu2phpj8l89vuqkaom/1717228230.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/de2fae35677f6f597f71a9332f0df280/98235874217.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/30148276738.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tgd44jl418et3t6qbm6i057c7s/nijenuxokesevamotino.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160867872b6d21---83358036836.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/jalevagularasasuku.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/vopone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=thermal+switch+symbolPDF 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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 16380 bytes
SHA-256: 3961526ae25ed5e1b7487cf4e5bc98c6f7d58b6f4ff574c9ec7932e51a0d5bc1
font_01_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 10692 bytes
SHA-256: e2c915f95e6ac37d553c40971637536e773f0cfb97435484012f27ef823402e2
font_02_sfnt_off000122be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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