Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0de693bdc9f36b8…

MALICIOUS

PDF

79.3 KB Created: 2021-09-02 03:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 890d8c803785993c613ef938ed65ae7d SHA-1: e10597ccff5aaa11191b963bcfe6d6c5123f2e09 SHA-256: f0de693bdc9f36b87205e7d54d2609169b0bd1a3c754dfbc0df18572b5ef27ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bomberosdenavarra.com/userfiles_nexo/files/sazobemexowuwufa.pdf In PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/gesekizosineti.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/65990775811.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/sodag.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/vomomut.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/lebetesamo.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/zimifutepafojo.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/finutokedetegugev.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/26778648603.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/834edfbfe4160a4611ba48d0904eadc2/73563122278.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/48818057564.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/weserasojinunaga.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc0b6ae235---purakokirudamop.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/81427763412.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/bekatawikelad.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac432be27---ziwefujunivudoxubiwozu.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/65935779669.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/fikazesitusenobi.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/raximesirimot.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/mudure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=population+by+racePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/98943792309.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_off0000d55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55B 10556 bytes
SHA-256: e8407b285ffd032e997708bf486a67840ead5e312d646ac727f14b4f8e3b6e21
font_01_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 16432 bytes
SHA-256: 4029b201de8165dc82750ae0e2ae320d3a53079c791f29c05118168c5c993b49
font_02_sfnt_off000117fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1