Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff45060988bf787…

MALICIOUS

PDF

76.7 KB Created: 2021-09-22 16:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c0887bf0c9b68ef34c7cd3bfbfc6135f SHA-1: 1508794cb34cc988cabf75b7ae152af635850589 SHA-256: cff45060988bf7877c7eea44ea9a22ea86d7a4e28cbdf05194661914b67c06f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c013bc409e---84589040939.pdf In PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/xovukuwibavapix.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/dawaxogepejenizalekago.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/79388668028.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///potanod.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351f75d2f9b---84316653736.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/48910125117.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/67546550262.pdfIn PDF document text
    • https://eslms.com/userfiles/file/gejaragojesak.pdfIn PDF document text
    • http://mylodge-naoshima.com/48122288949.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/bd54cd83beeb3887dee82f1a68249351/mewijakifametivofireso.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/tonixilomibotadokel.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/degufifimivodibu.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5461a8d961259b691ede87b35d648f6d/nutagilozavo.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/21035350881.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/74035092168.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/xobeniwokowobuse.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/maderutododuro.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/kimeguzaxowopev.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/malesavukir.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/nokabusutuluwezitoluf.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/96954413240.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/jexexotagipol.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/29264292848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=my+talking+angela+hacked+apk+downloadPDF 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_off0000ca25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA25 16280 bytes
SHA-256: c91609dff2c269cb54a64f56aa875c23c2e753ab9d4f1e8391ed1c7b2e9c1e12
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 10812 bytes
SHA-256: e7210777eb034a3d78a19cd24f165218c7e82be3ae762eacabc1fc06e469e84a

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